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Finding the Fourth Proportional to 611,576.60, 917,364.90 and 399,000.20

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Solution

The fourth proportional to 611,576.60, 917,364.90 and 399,000.20 is: 598,500.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,576.60 : 917,364.90 = 399,000.20 : x
  2. Step 2: Convert to fraction form
    611,576.60/917,364.90 = 399,000.20/x
  3. Step 3: Cross multiply
    611,576.60x = 917,364.90 × 399,000.20
  4. Step 4: Simplify right side
    611,576.60x = 366,028,778,572.98
  5. Step 5: Solve for x
    x = 366,028,778,572.98/611,576.60
  6. Step 6: Final answer
    x = 598,500.30

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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.