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Finding the Fourth Proportional to 274.68, 378.45 and 187.20

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Solution

The fourth proportional to 274.68, 378.45 and 187.20 is: 257.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.68 : 378.45 = 187.20 : x
  2. Step 2: Convert to fraction form
    274.68/378.45 = 187.20/x
  3. Step 3: Cross multiply
    274.68x = 378.45 × 187.20
  4. Step 4: Simplify right side
    274.68x = 70,845.84
  5. Step 5: Solve for x
    x = 70,845.84/274.68
  6. Step 6: Final answer
    x = 257.92

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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.