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Finding the Fourth Proportional to 71,520.68, 98,697.61 and 39,688.90

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Solution

The fourth proportional to 71,520.68, 98,697.61 and 39,688.90 is: 54,770.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,520.68 : 98,697.61 = 39,688.90 : x
  2. Step 2: Convert to fraction form
    71,520.68/98,697.61 = 39,688.90/x
  3. Step 3: Cross multiply
    71,520.68x = 98,697.61 × 39,688.90
  4. Step 4: Simplify right side
    71,520.68x = 3,917,199,573.53
  5. Step 5: Solve for x
    x = 3,917,199,573.53/71,520.68
  6. Step 6: Final answer
    x = 54,770.17

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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.