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Finding the Fourth Proportional to 89.24, 132.91 and 87.90

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Solution

The fourth proportional to 89.24, 132.91 and 87.90 is: 130.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.24 : 132.91 = 87.90 : x
  2. Step 2: Convert to fraction form
    89.24/132.91 = 87.90/x
  3. Step 3: Cross multiply
    89.24x = 132.91 × 87.90
  4. Step 4: Simplify right side
    89.24x = 11,682.79
  5. Step 5: Solve for x
    x = 11,682.79/89.24
  6. Step 6: Final answer
    x = 130.91

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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.