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Finding the Fourth Proportional to 86.17, 129.26 and 29.17

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Solution

The fourth proportional to 86.17, 129.26 and 29.17 is: 43.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.17 : 129.26 = 29.17 : x
  2. Step 2: Convert to fraction form
    86.17/129.26 = 29.17/x
  3. Step 3: Cross multiply
    86.17x = 129.26 × 29.17
  4. Step 4: Simplify right side
    86.17x = 3,770.51
  5. Step 5: Solve for x
    x = 3,770.51/86.17
  6. Step 6: Final answer
    x = 43.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.