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Finding the Fourth Proportional to 391.28, 539.95 and 260.52

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Solution

The fourth proportional to 391.28, 539.95 and 260.52 is: 359.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.28 : 539.95 = 260.52 : x
  2. Step 2: Convert to fraction form
    391.28/539.95 = 260.52/x
  3. Step 3: Cross multiply
    391.28x = 539.95 × 260.52
  4. Step 4: Simplify right side
    391.28x = 140,667.12
  5. Step 5: Solve for x
    x = 140,667.12/391.28
  6. Step 6: Final answer
    x = 359.51

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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.