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Finding the Fourth Proportional to 169.40, 254.12 and 78.12

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Solution

The fourth proportional to 169.40, 254.12 and 78.12 is: 117.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.40 : 254.12 = 78.12 : x
  2. Step 2: Convert to fraction form
    169.40/254.12 = 78.12/x
  3. Step 3: Cross multiply
    169.40x = 254.12 × 78.12
  4. Step 4: Simplify right side
    169.40x = 19,851.85
  5. Step 5: Solve for x
    x = 19,851.85/169.40
  6. Step 6: Final answer
    x = 117.19

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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.