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Finding the Fourth Proportional to 129.93, 179.31 and 83.28

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Solution

The fourth proportional to 129.93, 179.31 and 83.28 is: 114.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.93 : 179.31 = 83.28 : x
  2. Step 2: Convert to fraction form
    129.93/179.31 = 83.28/x
  3. Step 3: Cross multiply
    129.93x = 179.31 × 83.28
  4. Step 4: Simplify right side
    129.93x = 14,932.94
  5. Step 5: Solve for x
    x = 14,932.94/129.93
  6. Step 6: Final answer
    x = 114.93

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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.