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Finding the Fourth Proportional to 418,427.40, 627,641.10 and 137,908.20

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Solution

The fourth proportional to 418,427.40, 627,641.10 and 137,908.20 is: 206,862.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,427.40 : 627,641.10 = 137,908.20 : x
  2. Step 2: Convert to fraction form
    418,427.40/627,641.10 = 137,908.20/x
  3. Step 3: Cross multiply
    418,427.40x = 627,641.10 × 137,908.20
  4. Step 4: Simplify right side
    418,427.40x = 86,556,854,347.02
  5. Step 5: Solve for x
    x = 86,556,854,347.02/418,427.40
  6. Step 6: Final answer
    x = 206,862.30

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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.