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Finding the Fourth Proportional to 391.12, 539.64 and 267.18

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Solution

The fourth proportional to 391.12, 539.64 and 267.18 is: 368.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.12 : 539.64 = 267.18 : x
  2. Step 2: Convert to fraction form
    391.12/539.64 = 267.18/x
  3. Step 3: Cross multiply
    391.12x = 539.64 × 267.18
  4. Step 4: Simplify right side
    391.12x = 144,181.02
  5. Step 5: Solve for x
    x = 144,181.02/391.12
  6. Step 6: Final answer
    x = 368.64

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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.