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Finding the Fourth Proportional to 129.98, 179.36 and 86.33

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Solution

The fourth proportional to 129.98, 179.36 and 86.33 is: 119.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.98 : 179.36 = 86.33 : x
  2. Step 2: Convert to fraction form
    129.98/179.36 = 86.33/x
  3. Step 3: Cross multiply
    129.98x = 179.36 × 86.33
  4. Step 4: Simplify right side
    129.98x = 15,484.15
  5. Step 5: Solve for x
    x = 15,484.15/129.98
  6. Step 6: Final answer
    x = 119.13

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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.