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Finding the Fourth Proportional to 251.92, 347.55 and 153.61

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Solution

The fourth proportional to 251.92, 347.55 and 153.61 is: 211.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.92 : 347.55 = 153.61 : x
  2. Step 2: Convert to fraction form
    251.92/347.55 = 153.61/x
  3. Step 3: Cross multiply
    251.92x = 347.55 × 153.61
  4. Step 4: Simplify right side
    251.92x = 53,387.16
  5. Step 5: Solve for x
    x = 53,387.16/251.92
  6. Step 6: Final answer
    x = 211.92

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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.