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Finding the Fourth Proportional to 89.02, 133.10 and 86.86

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Solution

The fourth proportional to 89.02, 133.10 and 86.86 is: 129.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.02 : 133.10 = 86.86 : x
  2. Step 2: Convert to fraction form
    89.02/133.10 = 86.86/x
  3. Step 3: Cross multiply
    89.02x = 133.10 × 86.86
  4. Step 4: Simplify right side
    89.02x = 11,561.07
  5. Step 5: Solve for x
    x = 11,561.07/89.02
  6. Step 6: Final answer
    x = 129.87

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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.