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Finding the Fourth Proportional to 169.50, 254.16 and 78.15

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Solution

The fourth proportional to 169.50, 254.16 and 78.15 is: 117.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.50 : 254.16 = 78.15 : x
  2. Step 2: Convert to fraction form
    169.50/254.16 = 78.15/x
  3. Step 3: Cross multiply
    169.50x = 254.16 × 78.15
  4. Step 4: Simplify right side
    169.50x = 19,862.60
  5. Step 5: Solve for x
    x = 19,862.60/169.50
  6. Step 6: Final answer
    x = 117.18

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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.