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Finding the Fourth Proportional to 129.89, 179.01 and 106.51

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Solution

The fourth proportional to 129.89, 179.01 and 106.51 is: 146.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.89 : 179.01 = 106.51 : x
  2. Step 2: Convert to fraction form
    129.89/179.01 = 106.51/x
  3. Step 3: Cross multiply
    129.89x = 179.01 × 106.51
  4. Step 4: Simplify right side
    129.89x = 19,065.91
  5. Step 5: Solve for x
    x = 19,065.91/129.89
  6. Step 6: Final answer
    x = 146.78

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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.