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Finding the Fourth Proportional to 418,519.40, 627,779.10 and 138,000.20

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Solution

The fourth proportional to 418,519.40, 627,779.10 and 138,000.20 is: 207,000.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,519.40 : 627,779.10 = 138,000.20 : x
  2. Step 2: Convert to fraction form
    418,519.40/627,779.10 = 138,000.20/x
  3. Step 3: Cross multiply
    418,519.40x = 627,779.10 × 138,000.20
  4. Step 4: Simplify right side
    418,519.40x = 86,633,641,355.82
  5. Step 5: Solve for x
    x = 86,633,641,355.82/418,519.40
  6. Step 6: Final answer
    x = 207,000.30

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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.