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Finding the Fourth Proportional to 129.97, 179.34 and 74.70

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Solution

The fourth proportional to 129.97, 179.34 and 74.70 is: 103.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.97 : 179.34 = 74.70 : x
  2. Step 2: Convert to fraction form
    129.97/179.34 = 74.70/x
  3. Step 3: Cross multiply
    129.97x = 179.34 × 74.70
  4. Step 4: Simplify right side
    129.97x = 13,395.80
  5. Step 5: Solve for x
    x = 13,395.80/129.97
  6. Step 6: Final answer
    x = 103.07

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.