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Finding the Fourth Proportional to 274.85, 379.29 and 155.20

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Solution

The fourth proportional to 274.85, 379.29 and 155.20 is: 214.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.85 : 379.29 = 155.20 : x
  2. Step 2: Convert to fraction form
    274.85/379.29 = 155.20/x
  3. Step 3: Cross multiply
    274.85x = 379.29 × 155.20
  4. Step 4: Simplify right side
    274.85x = 58,863.42
  5. Step 5: Solve for x
    x = 58,863.42/274.85
  6. Step 6: Final answer
    x = 214.17

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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.