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Finding the Fourth Proportional to 274.60, 378.52 and 215.45

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Solution

The fourth proportional to 274.60, 378.52 and 215.45 is: 296.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.60 : 378.52 = 215.45 : x
  2. Step 2: Convert to fraction form
    274.60/378.52 = 215.45/x
  3. Step 3: Cross multiply
    274.60x = 378.52 × 215.45
  4. Step 4: Simplify right side
    274.60x = 81,551.80
  5. Step 5: Solve for x
    x = 81,551.80/274.60
  6. Step 6: Final answer
    x = 296.98

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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.