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Finding the Fourth Proportional to 71,510.87, 98,689.64 and 39,679.85

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Solution

The fourth proportional to 71,510.87, 98,689.64 and 39,679.85 is: 54,760.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,510.87 : 98,689.64 = 39,679.85 : x
  2. Step 2: Convert to fraction form
    71,510.87/98,689.64 = 39,679.85/x
  3. Step 3: Cross multiply
    71,510.87x = 98,689.64 × 39,679.85
  4. Step 4: Simplify right side
    71,510.87x = 3,915,989,419.91
  5. Step 5: Solve for x
    x = 3,915,989,419.91/71,510.87
  6. Step 6: Final answer
    x = 54,760.76

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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.