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Finding the Fourth Proportional to 418,327.20, 627,490.80 and 388,802.70

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Solution

The fourth proportional to 418,327.20, 627,490.80 and 388,802.70 is: 583,204.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,327.20 : 627,490.80 = 388,802.70 : x
  2. Step 2: Convert to fraction form
    418,327.20/627,490.80 = 388,802.70/x
  3. Step 3: Cross multiply
    418,327.20x = 627,490.80 × 388,802.70
  4. Step 4: Simplify right side
    418,327.20x = 243,970,117,265.16
  5. Step 5: Solve for x
    x = 243,970,117,265.16/418,327.20
  6. Step 6: Final answer
    x = 583,204.05

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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.