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Finding the Fourth Proportional to 129.06, 193.20 and 74.76

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Solution

The fourth proportional to 129.06, 193.20 and 74.76 is: 111.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.06 : 193.20 = 74.76 : x
  2. Step 2: Convert to fraction form
    129.06/193.20 = 74.76/x
  3. Step 3: Cross multiply
    129.06x = 193.20 × 74.76
  4. Step 4: Simplify right side
    129.06x = 14,443.63
  5. Step 5: Solve for x
    x = 14,443.63/129.06
  6. Step 6: Final answer
    x = 111.91

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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.