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Finding the Fourth Proportional to 89.91, 124.11 and 68.13

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Solution

The fourth proportional to 89.91, 124.11 and 68.13 is: 94.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.91 : 124.11 = 68.13 : x
  2. Step 2: Convert to fraction form
    89.91/124.11 = 68.13/x
  3. Step 3: Cross multiply
    89.91x = 124.11 × 68.13
  4. Step 4: Simplify right side
    89.91x = 8,455.61
  5. Step 5: Solve for x
    x = 8,455.61/89.91
  6. Step 6: Final answer
    x = 94.05

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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.