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Finding the Fourth Proportional to 123.12, 169.90 and 74.01

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Solution

The fourth proportional to 123.12, 169.90 and 74.01 is: 102.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.12 : 169.90 = 74.01 : x
  2. Step 2: Convert to fraction form
    123.12/169.90 = 74.01/x
  3. Step 3: Cross multiply
    123.12x = 169.90 × 74.01
  4. Step 4: Simplify right side
    123.12x = 12,574.75
  5. Step 5: Solve for x
    x = 12,574.75/123.12
  6. Step 6: Final answer
    x = 102.13

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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.