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Finding the Fourth Proportional to 129.78, 179.16 and 86.19

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Solution

The fourth proportional to 129.78, 179.16 and 86.19 is: 118.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.78 : 179.16 = 86.19 : x
  2. Step 2: Convert to fraction form
    129.78/179.16 = 86.19/x
  3. Step 3: Cross multiply
    129.78x = 179.16 × 86.19
  4. Step 4: Simplify right side
    129.78x = 15,441.80
  5. Step 5: Solve for x
    x = 15,441.80/129.78
  6. Step 6: Final answer
    x = 118.98

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.