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Finding the Fourth Proportional to 129.01, 178.03 and 79.23

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Solution

The fourth proportional to 129.01, 178.03 and 79.23 is: 109.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.01 : 178.03 = 79.23 : x
  2. Step 2: Convert to fraction form
    129.01/178.03 = 79.23/x
  3. Step 3: Cross multiply
    129.01x = 178.03 × 79.23
  4. Step 4: Simplify right side
    129.01x = 14,104.92
  5. Step 5: Solve for x
    x = 14,104.92/129.01
  6. Step 6: Final answer
    x = 109.33

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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.