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Finding the Fourth Proportional to 71,139.66, 98,174.70 and 39,310.62

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Solution

The fourth proportional to 71,139.66, 98,174.70 and 39,310.62 is: 54,249.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,139.66 : 98,174.70 = 39,310.62 : x
  2. Step 2: Convert to fraction form
    71,139.66/98,174.70 = 39,310.62/x
  3. Step 3: Cross multiply
    71,139.66x = 98,174.70 × 39,310.62
  4. Step 4: Simplify right side
    71,139.66x = 3,859,308,325.31
  5. Step 5: Solve for x
    x = 3,859,308,325.31/71,139.66
  6. Step 6: Final answer
    x = 54,249.74

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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.