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Finding the Fourth Proportional to 80,778.58, 121,158.60 and 21,618.87

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Solution

The fourth proportional to 80,778.58, 121,158.60 and 21,618.87 is: 32,425.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,778.58 : 121,158.60 = 21,618.87 : x
  2. Step 2: Convert to fraction form
    80,778.58/121,158.60 = 21,618.87/x
  3. Step 3: Cross multiply
    80,778.58x = 121,158.60 × 21,618.87
  4. Step 4: Simplify right side
    80,778.58x = 2,619,312,022.78
  5. Step 5: Solve for x
    x = 2,619,312,022.78/80,778.58
  6. Step 6: Final answer
    x = 32,425.82

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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.