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Finding the Fourth Proportional to 129.23, 177.67 and 109.71

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Solution

The fourth proportional to 129.23, 177.67 and 109.71 is: 150.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.23 : 177.67 = 109.71 : x
  2. Step 2: Convert to fraction form
    129.23/177.67 = 109.71/x
  3. Step 3: Cross multiply
    129.23x = 177.67 × 109.71
  4. Step 4: Simplify right side
    129.23x = 19,492.18
  5. Step 5: Solve for x
    x = 19,492.18/129.23
  6. Step 6: Final answer
    x = 150.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.