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Finding the Fourth Proportional to 90.48, 123.79 and 89.97

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Solution

The fourth proportional to 90.48, 123.79 and 89.97 is: 123.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.48 : 123.79 = 89.97 : x
  2. Step 2: Convert to fraction form
    90.48/123.79 = 89.97/x
  3. Step 3: Cross multiply
    90.48x = 123.79 × 89.97
  4. Step 4: Simplify right side
    90.48x = 11,137.39
  5. Step 5: Solve for x
    x = 11,137.39/90.48
  6. Step 6: Final answer
    x = 123.09

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.