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Finding the Fourth Proportional to 129.12, 192.68 and 120.86

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Solution

The fourth proportional to 129.12, 192.68 and 120.86 is: 180.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.12 : 192.68 = 120.86 : x
  2. Step 2: Convert to fraction form
    129.12/192.68 = 120.86/x
  3. Step 3: Cross multiply
    129.12x = 192.68 × 120.86
  4. Step 4: Simplify right side
    129.12x = 23,287.30
  5. Step 5: Solve for x
    x = 23,287.30/129.12
  6. Step 6: Final answer
    x = 180.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.