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Finding the Fourth Proportional to 129.91, 179.31 and 88.51

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Solution

The fourth proportional to 129.91, 179.31 and 88.51 is: 122.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.91 : 179.31 = 88.51 : x
  2. Step 2: Convert to fraction form
    129.91/179.31 = 88.51/x
  3. Step 3: Cross multiply
    129.91x = 179.31 × 88.51
  4. Step 4: Simplify right side
    129.91x = 15,870.73
  5. Step 5: Solve for x
    x = 15,870.73/129.91
  6. Step 6: Final answer
    x = 122.17

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Why These Related Problems?

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