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Finding the Fourth Proportional to 251.78, 347.27 and 153.46

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Solution

The fourth proportional to 251.78, 347.27 and 153.46 is: 211.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.78 : 347.27 = 153.46 : x
  2. Step 2: Convert to fraction form
    251.78/347.27 = 153.46/x
  3. Step 3: Cross multiply
    251.78x = 347.27 × 153.46
  4. Step 4: Simplify right side
    251.78x = 53,291.57
  5. Step 5: Solve for x
    x = 53,291.57/251.78
  6. Step 6: Final answer
    x = 211.66

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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.