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Finding the Fourth Proportional to 129.08, 177.88 and 120.43

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Solution

The fourth proportional to 129.08, 177.88 and 120.43 is: 165.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.08 : 177.88 = 120.43 : x
  2. Step 2: Convert to fraction form
    129.08/177.88 = 120.43/x
  3. Step 3: Cross multiply
    129.08x = 177.88 × 120.43
  4. Step 4: Simplify right side
    129.08x = 21,421.23
  5. Step 5: Solve for x
    x = 21,421.23/129.08
  6. Step 6: Final answer
    x = 165.95

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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.