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Finding the Fourth Proportional to 169.40, 254.12 and 61.20

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Solution

The fourth proportional to 169.40, 254.12 and 61.20 is: 91.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.40 : 254.12 = 61.20 : x
  2. Step 2: Convert to fraction form
    169.40/254.12 = 61.20/x
  3. Step 3: Cross multiply
    169.40x = 254.12 × 61.20
  4. Step 4: Simplify right side
    169.40x = 15,552.14
  5. Step 5: Solve for x
    x = 15,552.14/169.40
  6. Step 6: Final answer
    x = 91.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.