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Finding the Fourth Proportional to 91,329.20, 136,991.88 and 42,081.20

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Solution

The fourth proportional to 91,329.20, 136,991.88 and 42,081.20 is: 63,120.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,329.20 : 136,991.88 = 42,081.20 : x
  2. Step 2: Convert to fraction form
    91,329.20/136,991.88 = 42,081.20/x
  3. Step 3: Cross multiply
    91,329.20x = 136,991.88 × 42,081.20
  4. Step 4: Simplify right side
    91,329.20x = 5,764,782,700.66
  5. Step 5: Solve for x
    x = 5,764,782,700.66/91,329.20
  6. Step 6: Final answer
    x = 63,120.92

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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.