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Finding the Fourth Proportional to 134.92, 202.20 and 61.78

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Solution

The fourth proportional to 134.92, 202.20 and 61.78 is: 92.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.92 : 202.20 = 61.78 : x
  2. Step 2: Convert to fraction form
    134.92/202.20 = 61.78/x
  3. Step 3: Cross multiply
    134.92x = 202.20 × 61.78
  4. Step 4: Simplify right side
    134.92x = 12,491.92
  5. Step 5: Solve for x
    x = 12,491.92/134.92
  6. Step 6: Final answer
    x = 92.59

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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.