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Finding the Fourth Proportional to 89.43, 123.30 and 68.72

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Solution

The fourth proportional to 89.43, 123.30 and 68.72 is: 94.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.43 : 123.30 = 68.72 : x
  2. Step 2: Convert to fraction form
    89.43/123.30 = 68.72/x
  3. Step 3: Cross multiply
    89.43x = 123.30 × 68.72
  4. Step 4: Simplify right side
    89.43x = 8,472.56
  5. Step 5: Solve for x
    x = 8,472.56/89.43
  6. Step 6: Final answer
    x = 94.74

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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.