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Finding the Fourth Proportional to 391.64, 540.78 and 267.56

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Solution

The fourth proportional to 391.64, 540.78 and 267.56 is: 369.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.64 : 540.78 = 267.56 : x
  2. Step 2: Convert to fraction form
    391.64/540.78 = 267.56/x
  3. Step 3: Cross multiply
    391.64x = 540.78 × 267.56
  4. Step 4: Simplify right side
    391.64x = 144,691.10
  5. Step 5: Solve for x
    x = 144,691.10/391.64
  6. Step 6: Final answer
    x = 369.45

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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.