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Finding the Fourth Proportional to 391.52, 540.32 and 267.20

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Solution

The fourth proportional to 391.52, 540.32 and 267.20 is: 368.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.52 : 540.32 = 267.20 : x
  2. Step 2: Convert to fraction form
    391.52/540.32 = 267.20/x
  3. Step 3: Cross multiply
    391.52x = 540.32 × 267.20
  4. Step 4: Simplify right side
    391.52x = 144,373.50
  5. Step 5: Solve for x
    x = 144,373.50/391.52
  6. Step 6: Final answer
    x = 368.75

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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.