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Finding the Fourth Proportional to 651,107.80, 976,661.70 and 399,165.40

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Solution

The fourth proportional to 651,107.80, 976,661.70 and 399,165.40 is: 598,748.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,107.80 : 976,661.70 = 399,165.40 : x
  2. Step 2: Convert to fraction form
    651,107.80/976,661.70 = 399,165.40/x
  3. Step 3: Cross multiply
    651,107.80x = 976,661.70 × 399,165.40
  4. Step 4: Simplify right side
    651,107.80x = 389,849,558,145.18
  5. Step 5: Solve for x
    x = 389,849,558,145.18/651,107.80
  6. Step 6: Final answer
    x = 598,748.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.