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Finding the Fourth Proportional to 509,008.80, 763,513.20 and 257,066.40

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Solution

The fourth proportional to 509,008.80, 763,513.20 and 257,066.40 is: 385,599.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,008.80 : 763,513.20 = 257,066.40 : x
  2. Step 2: Convert to fraction form
    509,008.80/763,513.20 = 257,066.40/x
  3. Step 3: Cross multiply
    509,008.80x = 763,513.20 × 257,066.40
  4. Step 4: Simplify right side
    509,008.80x = 196,273,589,676.48
  5. Step 5: Solve for x
    x = 196,273,589,676.48/509,008.80
  6. Step 6: Final answer
    x = 385,599.60

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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.