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Finding the Fourth Proportional to 86,121.80, 129,046.26 and 66,448.52

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Solution

The fourth proportional to 86,121.80, 129,046.26 and 66,448.52 is: 99,567.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,121.80 : 129,046.26 = 66,448.52 : x
  2. Step 2: Convert to fraction form
    86,121.80/129,046.26 = 66,448.52/x
  3. Step 3: Cross multiply
    86,121.80x = 129,046.26 × 66,448.52
  4. Step 4: Simplify right side
    86,121.80x = 8,574,932,988.54
  5. Step 5: Solve for x
    x = 8,574,932,988.54/86,121.80
  6. Step 6: Final answer
    x = 99,567.51

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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.