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Finding the Fourth Proportional to 148.72, 223.28 and 121.72

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Solution

The fourth proportional to 148.72, 223.28 and 121.72 is: 182.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.72 : 223.28 = 121.72 : x
  2. Step 2: Convert to fraction form
    148.72/223.28 = 121.72/x
  3. Step 3: Cross multiply
    148.72x = 223.28 × 121.72
  4. Step 4: Simplify right side
    148.72x = 27,177.64
  5. Step 5: Solve for x
    x = 27,177.64/148.72
  6. Step 6: Final answer
    x = 182.74

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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.