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Finding the Fourth Proportional to 274.91, 379.34 and 156.86

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Solution

The fourth proportional to 274.91, 379.34 and 156.86 is: 216.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.91 : 379.34 = 156.86 : x
  2. Step 2: Convert to fraction form
    274.91/379.34 = 156.86/x
  3. Step 3: Cross multiply
    274.91x = 379.34 × 156.86
  4. Step 4: Simplify right side
    274.91x = 59,503.27
  5. Step 5: Solve for x
    x = 59,503.27/274.91
  6. Step 6: Final answer
    x = 216.45

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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.