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Finding the Fourth Proportional to 71,511.88, 98,686.39 and 39,685.90

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Solution

The fourth proportional to 71,511.88, 98,686.39 and 39,685.90 is: 54,766.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,511.88 : 98,686.39 = 39,685.90 : x
  2. Step 2: Convert to fraction form
    71,511.88/98,686.39 = 39,685.90/x
  3. Step 3: Cross multiply
    71,511.88x = 98,686.39 × 39,685.90
  4. Step 4: Simplify right side
    71,511.88x = 3,916,457,711.47
  5. Step 5: Solve for x
    x = 3,916,457,711.47/71,511.88
  6. Step 6: Final answer
    x = 54,766.54

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.