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Finding the Fourth Proportional to 89.81, 123.68 and 83.87

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Solution

The fourth proportional to 89.81, 123.68 and 83.87 is: 115.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.81 : 123.68 = 83.87 : x
  2. Step 2: Convert to fraction form
    89.81/123.68 = 83.87/x
  3. Step 3: Cross multiply
    89.81x = 123.68 × 83.87
  4. Step 4: Simplify right side
    89.81x = 10,372.63
  5. Step 5: Solve for x
    x = 10,372.63/89.81
  6. Step 6: Final answer
    x = 115.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.