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Finding the Fourth Proportional to 398,983.80, 598,475.70 and 391,985.40

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Solution

The fourth proportional to 398,983.80, 598,475.70 and 391,985.40 is: 587,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,983.80 : 598,475.70 = 391,985.40 : x
  2. Step 2: Convert to fraction form
    398,983.80/598,475.70 = 391,985.40/x
  3. Step 3: Cross multiply
    398,983.80x = 598,475.70 × 391,985.40
  4. Step 4: Simplify right side
    398,983.80x = 234,593,736,654.78
  5. Step 5: Solve for x
    x = 234,593,736,654.78/398,983.80
  6. Step 6: Final answer
    x = 587,978.10

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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.