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Finding the Fourth Proportional to 89.73, 123.78 and 58.65

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Solution

The fourth proportional to 89.73, 123.78 and 58.65 is: 80.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.73 : 123.78 = 58.65 : x
  2. Step 2: Convert to fraction form
    89.73/123.78 = 58.65/x
  3. Step 3: Cross multiply
    89.73x = 123.78 × 58.65
  4. Step 4: Simplify right side
    89.73x = 7,259.47
  5. Step 5: Solve for x
    x = 7,259.47/89.73
  6. Step 6: Final answer
    x = 80.90

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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.