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Finding the Fourth Proportional to 89.74, 133.75 and 87.94

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Solution

The fourth proportional to 89.74, 133.75 and 87.94 is: 131.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.74 : 133.75 = 87.94 : x
  2. Step 2: Convert to fraction form
    89.74/133.75 = 87.94/x
  3. Step 3: Cross multiply
    89.74x = 133.75 × 87.94
  4. Step 4: Simplify right side
    89.74x = 11,761.98
  5. Step 5: Solve for x
    x = 11,761.98/89.74
  6. Step 6: Final answer
    x = 131.07

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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.