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Finding the Fourth Proportional to 180.70, 249.42 and 103.12

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Solution

The fourth proportional to 180.70, 249.42 and 103.12 is: 142.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.70 : 249.42 = 103.12 : x
  2. Step 2: Convert to fraction form
    180.70/249.42 = 103.12/x
  3. Step 3: Cross multiply
    180.70x = 249.42 × 103.12
  4. Step 4: Simplify right side
    180.70x = 25,720.19
  5. Step 5: Solve for x
    x = 25,720.19/180.70
  6. Step 6: Final answer
    x = 142.34

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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.