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Finding the Fourth Proportional to 123.15, 169.96 and 74.06

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Solution

The fourth proportional to 123.15, 169.96 and 74.06 is: 102.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.15 : 169.96 = 74.06 : x
  2. Step 2: Convert to fraction form
    123.15/169.96 = 74.06/x
  3. Step 3: Cross multiply
    123.15x = 169.96 × 74.06
  4. Step 4: Simplify right side
    123.15x = 12,586.98
  5. Step 5: Solve for x
    x = 12,586.98/123.15
  6. Step 6: Final answer
    x = 102.21

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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.