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Finding the Fourth Proportional to 71,507.78, 98,682.96 and 39,679.64

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Solution

The fourth proportional to 71,507.78, 98,682.96 and 39,679.64 is: 54,759.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,507.78 : 98,682.96 = 39,679.64 : x
  2. Step 2: Convert to fraction form
    71,507.78/98,682.96 = 39,679.64/x
  3. Step 3: Cross multiply
    71,507.78x = 98,682.96 × 39,679.64
  4. Step 4: Simplify right side
    71,507.78x = 3,915,704,129.18
  5. Step 5: Solve for x
    x = 3,915,704,129.18/71,507.78
  6. Step 6: Final answer
    x = 54,759.14

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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.