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Finding the Fourth Proportional to 180.57, 270.96 and 139.47

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Solution

The fourth proportional to 180.57, 270.96 and 139.47 is: 209.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.57 : 270.96 = 139.47 : x
  2. Step 2: Convert to fraction form
    180.57/270.96 = 139.47/x
  3. Step 3: Cross multiply
    180.57x = 270.96 × 139.47
  4. Step 4: Simplify right side
    180.57x = 37,790.79
  5. Step 5: Solve for x
    x = 37,790.79/180.57
  6. Step 6: Final answer
    x = 209.29

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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.