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Finding the Fourth Proportional to 88.29, 131.42 and 86.99

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Solution

The fourth proportional to 88.29, 131.42 and 86.99 is: 129.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.29 : 131.42 = 86.99 : x
  2. Step 2: Convert to fraction form
    88.29/131.42 = 86.99/x
  3. Step 3: Cross multiply
    88.29x = 131.42 × 86.99
  4. Step 4: Simplify right side
    88.29x = 11,432.23
  5. Step 5: Solve for x
    x = 11,432.23/88.29
  6. Step 6: Final answer
    x = 129.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.