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Finding the Fourth Proportional to 180.30, 270.05 and 139.40

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Solution

The fourth proportional to 180.30, 270.05 and 139.40 is: 208.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.30 : 270.05 = 139.40 : x
  2. Step 2: Convert to fraction form
    180.30/270.05 = 139.40/x
  3. Step 3: Cross multiply
    180.30x = 270.05 × 139.40
  4. Step 4: Simplify right side
    180.30x = 37,644.97
  5. Step 5: Solve for x
    x = 37,644.97/180.30
  6. Step 6: Final answer
    x = 208.79

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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.