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Finding the Fourth Proportional to 71,691.30, 98,933.67 and 39,858.30

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Solution

The fourth proportional to 71,691.30, 98,933.67 and 39,858.30 is: 55,004.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,691.30 : 98,933.67 = 39,858.30 : x
  2. Step 2: Convert to fraction form
    71,691.30/98,933.67 = 39,858.30/x
  3. Step 3: Cross multiply
    71,691.30x = 98,933.67 × 39,858.30
  4. Step 4: Simplify right side
    71,691.30x = 3,943,327,898.96
  5. Step 5: Solve for x
    x = 3,943,327,898.96/71,691.30
  6. Step 6: Final answer
    x = 55,004.27

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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.