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Finding the Fourth Proportional to 251.75, 347.42 and 153.49

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Solution

The fourth proportional to 251.75, 347.42 and 153.49 is: 211.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.75 : 347.42 = 153.49 : x
  2. Step 2: Convert to fraction form
    251.75/347.42 = 153.49/x
  3. Step 3: Cross multiply
    251.75x = 347.42 × 153.49
  4. Step 4: Simplify right side
    251.75x = 53,325.50
  5. Step 5: Solve for x
    x = 53,325.50/251.75
  6. Step 6: Final answer
    x = 211.82

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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.