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Finding the Fourth Proportional to 123.46, 170.22 and 79.72

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Solution

The fourth proportional to 123.46, 170.22 and 79.72 is: 109.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.46 : 170.22 = 79.72 : x
  2. Step 2: Convert to fraction form
    123.46/170.22 = 79.72/x
  3. Step 3: Cross multiply
    123.46x = 170.22 × 79.72
  4. Step 4: Simplify right side
    123.46x = 13,569.94
  5. Step 5: Solve for x
    x = 13,569.94/123.46
  6. Step 6: Final answer
    x = 109.91

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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.