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Finding the Fourth Proportional to 180.80, 249.40 and 103.16

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Solution

The fourth proportional to 180.80, 249.40 and 103.16 is: 142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.80 : 249.40 = 103.16 : x
  2. Step 2: Convert to fraction form
    180.80/249.40 = 103.16/x
  3. Step 3: Cross multiply
    180.80x = 249.40 × 103.16
  4. Step 4: Simplify right side
    180.80x = 25,728.10
  5. Step 5: Solve for x
    x = 25,728.10/180.80
  6. Step 6: Final answer
    x = 142.30

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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.