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Finding the Fourth Proportional to 274.81, 379.29 and 187.78

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Solution

The fourth proportional to 274.81, 379.29 and 187.78 is: 259.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.81 : 379.29 = 187.78 : x
  2. Step 2: Convert to fraction form
    274.81/379.29 = 187.78/x
  3. Step 3: Cross multiply
    274.81x = 379.29 × 187.78
  4. Step 4: Simplify right side
    274.81x = 71,223.08
  5. Step 5: Solve for x
    x = 71,223.08/274.81
  6. Step 6: Final answer
    x = 259.17

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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.