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Finding the Fourth Proportional to 86.49, 129.66 and 67.13

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Solution

The fourth proportional to 86.49, 129.66 and 67.13 is: 100.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.49 : 129.66 = 67.13 : x
  2. Step 2: Convert to fraction form
    86.49/129.66 = 67.13/x
  3. Step 3: Cross multiply
    86.49x = 129.66 × 67.13
  4. Step 4: Simplify right side
    86.49x = 8,703.18
  5. Step 5: Solve for x
    x = 8,703.18/86.49
  6. Step 6: Final answer
    x = 100.63

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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.