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Finding the Fourth Proportional to 180.90, 270.81 and 112.21

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Solution

The fourth proportional to 180.90, 270.81 and 112.21 is: 167.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.90 : 270.81 = 112.21 : x
  2. Step 2: Convert to fraction form
    180.90/270.81 = 112.21/x
  3. Step 3: Cross multiply
    180.90x = 270.81 × 112.21
  4. Step 4: Simplify right side
    180.90x = 30,386.91
  5. Step 5: Solve for x
    x = 30,386.91/180.90
  6. Step 6: Final answer
    x = 167.98

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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.