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Finding the Fourth Proportional to 142.92, 214.24 and 77.95

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Solution

The fourth proportional to 142.92, 214.24 and 77.95 is: 116.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.92 : 214.24 = 77.95 : x
  2. Step 2: Convert to fraction form
    142.92/214.24 = 77.95/x
  3. Step 3: Cross multiply
    142.92x = 214.24 × 77.95
  4. Step 4: Simplify right side
    142.92x = 16,698.94
  5. Step 5: Solve for x
    x = 16,698.94/142.92
  6. Step 6: Final answer
    x = 116.85

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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.