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Finding the Fourth Proportional to 129.81, 178.88 and 106.43

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Solution

The fourth proportional to 129.81, 178.88 and 106.43 is: 146.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.81 : 178.88 = 106.43 : x
  2. Step 2: Convert to fraction form
    129.81/178.88 = 106.43/x
  3. Step 3: Cross multiply
    129.81x = 178.88 × 106.43
  4. Step 4: Simplify right side
    129.81x = 19,036.77
  5. Step 5: Solve for x
    x = 19,036.77/129.81
  6. Step 6: Final answer
    x = 146.65

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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.