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Finding the Fourth Proportional to 89.49, 133.37 and 87.69

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Solution

The fourth proportional to 89.49, 133.37 and 87.69 is: 130.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.49 : 133.37 = 87.69 : x
  2. Step 2: Convert to fraction form
    89.49/133.37 = 87.69/x
  3. Step 3: Cross multiply
    89.49x = 133.37 × 87.69
  4. Step 4: Simplify right side
    89.49x = 11,695.43
  5. Step 5: Solve for x
    x = 11,695.43/89.49
  6. Step 6: Final answer
    x = 130.69

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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.