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Finding the Fourth Proportional to 89.93, 123.96 and 74.36

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Solution

The fourth proportional to 89.93, 123.96 and 74.36 is: 102.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.93 : 123.96 = 74.36 : x
  2. Step 2: Convert to fraction form
    89.93/123.96 = 74.36/x
  3. Step 3: Cross multiply
    89.93x = 123.96 × 74.36
  4. Step 4: Simplify right side
    89.93x = 9,217.05
  5. Step 5: Solve for x
    x = 9,217.05/89.93
  6. Step 6: Final answer
    x = 102.50

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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.