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Finding the Fourth Proportional to 141.92, 212.96 and 77.76

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Solution

The fourth proportional to 141.92, 212.96 and 77.76 is: 116.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.92 : 212.96 = 77.76 : x
  2. Step 2: Convert to fraction form
    141.92/212.96 = 77.76/x
  3. Step 3: Cross multiply
    141.92x = 212.96 × 77.76
  4. Step 4: Simplify right side
    141.92x = 16,559.77
  5. Step 5: Solve for x
    x = 16,559.77/141.92
  6. Step 6: Final answer
    x = 116.68

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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.