Home / 521,011.40-781,517.10-395,040.20

Finding the Fourth Proportional to 521,011.40, 781,517.10 and 395,040.20

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Solution

The fourth proportional to 521,011.40, 781,517.10 and 395,040.20 is: 592,560.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,011.40 : 781,517.10 = 395,040.20 : x
  2. Step 2: Convert to fraction form
    521,011.40/781,517.10 = 395,040.20/x
  3. Step 3: Cross multiply
    521,011.40x = 781,517.10 × 395,040.20
  4. Step 4: Simplify right side
    521,011.40x = 308,730,671,487.42
  5. Step 5: Solve for x
    x = 308,730,671,487.42/521,011.40
  6. Step 6: Final answer
    x = 592,560.30

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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.