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Finding the Fourth Proportional to 274.34, 378.61 and 157.88

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Solution

The fourth proportional to 274.34, 378.61 and 157.88 is: 217.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.34 : 378.61 = 157.88 : x
  2. Step 2: Convert to fraction form
    274.34/378.61 = 157.88/x
  3. Step 3: Cross multiply
    274.34x = 378.61 × 157.88
  4. Step 4: Simplify right side
    274.34x = 59,774.95
  5. Step 5: Solve for x
    x = 59,774.95/274.34
  6. Step 6: Final answer
    x = 217.89

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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.