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Finding the Fourth Proportional to 274.70, 378.88 and 187.40

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Solution

The fourth proportional to 274.70, 378.88 and 187.40 is: 258.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.70 : 378.88 = 187.40 : x
  2. Step 2: Convert to fraction form
    274.70/378.88 = 187.40/x
  3. Step 3: Cross multiply
    274.70x = 378.88 × 187.40
  4. Step 4: Simplify right side
    274.70x = 70,999.75
  5. Step 5: Solve for x
    x = 70,999.75/274.70
  6. Step 6: Final answer
    x = 258.47

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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.