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Finding the Fourth Proportional to 274.72, 379.10 and 156.70

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Solution

The fourth proportional to 274.72, 379.10 and 156.70 is: 216.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.72 : 379.10 = 156.70 : x
  2. Step 2: Convert to fraction form
    274.72/379.10 = 156.70/x
  3. Step 3: Cross multiply
    274.72x = 379.10 × 156.70
  4. Step 4: Simplify right side
    274.72x = 59,404.97
  5. Step 5: Solve for x
    x = 59,404.97/274.72
  6. Step 6: Final answer
    x = 216.24

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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.