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Finding the Fourth Proportional to 89.41, 133.43 and 87.39

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Solution

The fourth proportional to 89.41, 133.43 and 87.39 is: 130.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.41 : 133.43 = 87.39 : x
  2. Step 2: Convert to fraction form
    89.41/133.43 = 87.39/x
  3. Step 3: Cross multiply
    89.41x = 133.43 × 87.39
  4. Step 4: Simplify right side
    89.41x = 11,660.45
  5. Step 5: Solve for x
    x = 11,660.45/89.41
  6. Step 6: Final answer
    x = 130.42

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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.