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Finding the Fourth Proportional to 81,752.97, 122,515.27 and 39,621.87

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Solution

The fourth proportional to 81,752.97, 122,515.27 and 39,621.87 is: 59,377.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,752.97 : 122,515.27 = 39,621.87 : x
  2. Step 2: Convert to fraction form
    81,752.97/122,515.27 = 39,621.87/x
  3. Step 3: Cross multiply
    81,752.97x = 122,515.27 × 39,621.87
  4. Step 4: Simplify right side
    81,752.97x = 4,854,284,100.95
  5. Step 5: Solve for x
    x = 4,854,284,100.95/81,752.97
  6. Step 6: Final answer
    x = 59,377.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.