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Finding the Fourth Proportional to 88.29, 131.91 and 86.67

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Solution

The fourth proportional to 88.29, 131.91 and 86.67 is: 129.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.29 : 131.91 = 86.67 : x
  2. Step 2: Convert to fraction form
    88.29/131.91 = 86.67/x
  3. Step 3: Cross multiply
    88.29x = 131.91 × 86.67
  4. Step 4: Simplify right side
    88.29x = 11,432.64
  5. Step 5: Solve for x
    x = 11,432.64/88.29
  6. Step 6: Final answer
    x = 129.49

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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.