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Finding the Fourth Proportional to 89.74, 133.82 and 78.95

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Solution

The fourth proportional to 89.74, 133.82 and 78.95 is: 117.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.74 : 133.82 = 78.95 : x
  2. Step 2: Convert to fraction form
    89.74/133.82 = 78.95/x
  3. Step 3: Cross multiply
    89.74x = 133.82 × 78.95
  4. Step 4: Simplify right side
    89.74x = 10,565.09
  5. Step 5: Solve for x
    x = 10,565.09/89.74
  6. Step 6: Final answer
    x = 117.73

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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.