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Finding the Fourth Proportional to 177.20, 244.50 and 111.72

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Solution

The fourth proportional to 177.20, 244.50 and 111.72 is: 154.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.20 : 244.50 = 111.72 : x
  2. Step 2: Convert to fraction form
    177.20/244.50 = 111.72/x
  3. Step 3: Cross multiply
    177.20x = 244.50 × 111.72
  4. Step 4: Simplify right side
    177.20x = 27,315.54
  5. Step 5: Solve for x
    x = 27,315.54/177.20
  6. Step 6: Final answer
    x = 154.16

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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.