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Finding the Fourth Proportional to 237.20, 355.28 and 115.20

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Solution

The fourth proportional to 237.20, 355.28 and 115.20 is: 172.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    237.20 : 355.28 = 115.20 : x
  2. Step 2: Convert to fraction form
    237.20/355.28 = 115.20/x
  3. Step 3: Cross multiply
    237.20x = 355.28 × 115.20
  4. Step 4: Simplify right side
    237.20x = 40,927.68
  5. Step 5: Solve for x
    x = 40,927.68/237.20
  6. Step 6: Final answer
    x = 172.55

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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.