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Finding the Fourth Proportional to 71,591.40, 98,791.92 and 39,758.40

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Solution

The fourth proportional to 71,591.40, 98,791.92 and 39,758.40 is: 54,864.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,591.40 : 98,791.92 = 39,758.40 : x
  2. Step 2: Convert to fraction form
    71,591.40/98,791.92 = 39,758.40/x
  3. Step 3: Cross multiply
    71,591.40x = 98,791.92 × 39,758.40
  4. Step 4: Simplify right side
    71,591.40x = 3,927,808,672.13
  5. Step 5: Solve for x
    x = 3,927,808,672.13/71,591.40
  6. Step 6: Final answer
    x = 54,864.25

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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.