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Finding the Fourth Proportional to 71,686.36, 98,929.66 and 39,422.30

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Solution

The fourth proportional to 71,686.36, 98,929.66 and 39,422.30 is: 54,404.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,686.36 : 98,929.66 = 39,422.30 : x
  2. Step 2: Convert to fraction form
    71,686.36/98,929.66 = 39,422.30/x
  3. Step 3: Cross multiply
    71,686.36x = 98,929.66 × 39,422.30
  4. Step 4: Simplify right side
    71,686.36x = 3,900,034,735.42
  5. Step 5: Solve for x
    x = 3,900,034,735.42/71,686.36
  6. Step 6: Final answer
    x = 54,404.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.