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Finding the Fourth Proportional to 418,039.80, 627,059.70 and 390,046.20

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Solution

The fourth proportional to 418,039.80, 627,059.70 and 390,046.20 is: 585,069.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,039.80 : 627,059.70 = 390,046.20 : x
  2. Step 2: Convert to fraction form
    418,039.80/627,059.70 = 390,046.20/x
  3. Step 3: Cross multiply
    418,039.80x = 627,059.70 × 390,046.20
  4. Step 4: Simplify right side
    418,039.80x = 244,582,253,158.14
  5. Step 5: Solve for x
    x = 244,582,253,158.14/418,039.80
  6. Step 6: Final answer
    x = 585,069.30

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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.