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Finding the Fourth Proportional to 391.36, 539.98 and 267.09

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Solution

The fourth proportional to 391.36, 539.98 and 267.09 is: 368.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.36 : 539.98 = 267.09 : x
  2. Step 2: Convert to fraction form
    391.36/539.98 = 267.09/x
  3. Step 3: Cross multiply
    391.36x = 539.98 × 267.09
  4. Step 4: Simplify right side
    391.36x = 144,223.26
  5. Step 5: Solve for x
    x = 144,223.26/391.36
  6. Step 6: Final answer
    x = 368.52

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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.