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Finding the Fourth Proportional to 141.76, 212.88 and 77.68

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Solution

The fourth proportional to 141.76, 212.88 and 77.68 is: 116.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.76 : 212.88 = 77.68 : x
  2. Step 2: Convert to fraction form
    141.76/212.88 = 77.68/x
  3. Step 3: Cross multiply
    141.76x = 212.88 × 77.68
  4. Step 4: Simplify right side
    141.76x = 16,536.52
  5. Step 5: Solve for x
    x = 16,536.52/141.76
  6. Step 6: Final answer
    x = 116.65

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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.