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Finding the Fourth Proportional to 180.74, 249.48 and 139.24

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Solution

The fourth proportional to 180.74, 249.48 and 139.24 is: 192.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.74 : 249.48 = 139.24 : x
  2. Step 2: Convert to fraction form
    180.74/249.48 = 139.24/x
  3. Step 3: Cross multiply
    180.74x = 249.48 × 139.24
  4. Step 4: Simplify right side
    180.74x = 34,737.91
  5. Step 5: Solve for x
    x = 34,737.91/180.74
  6. Step 6: Final answer
    x = 192.20

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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.