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Finding the Fourth Proportional to 143.92, 216.21 and 86.29

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Solution

The fourth proportional to 143.92, 216.21 and 86.29 is: 129.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.92 : 216.21 = 86.29 : x
  2. Step 2: Convert to fraction form
    143.92/216.21 = 86.29/x
  3. Step 3: Cross multiply
    143.92x = 216.21 × 86.29
  4. Step 4: Simplify right side
    143.92x = 18,656.76
  5. Step 5: Solve for x
    x = 18,656.76/143.92
  6. Step 6: Final answer
    x = 129.63

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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.