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Finding the Fourth Proportional to 89.96, 134.28 and 87.39

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Solution

The fourth proportional to 89.96, 134.28 and 87.39 is: 130.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.96 : 134.28 = 87.39 : x
  2. Step 2: Convert to fraction form
    89.96/134.28 = 87.39/x
  3. Step 3: Cross multiply
    89.96x = 134.28 × 87.39
  4. Step 4: Simplify right side
    89.96x = 11,734.73
  5. Step 5: Solve for x
    x = 11,734.73/89.96
  6. Step 6: Final answer
    x = 130.45

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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.