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Finding the Fourth Proportional to 71,689.05, 98,934.21 and 39,868.20

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Solution

The fourth proportional to 71,689.05, 98,934.21 and 39,868.20 is: 55,019.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,689.05 : 98,934.21 = 39,868.20 : x
  2. Step 2: Convert to fraction form
    71,689.05/98,934.21 = 39,868.20/x
  3. Step 3: Cross multiply
    71,689.05x = 98,934.21 × 39,868.20
  4. Step 4: Simplify right side
    71,689.05x = 3,944,328,871.12
  5. Step 5: Solve for x
    x = 3,944,328,871.12/71,689.05
  6. Step 6: Final answer
    x = 55,019.96

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Double scale
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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.