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Finding the Fourth Proportional to 391.23, 539.73 and 260.28

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Solution

The fourth proportional to 391.23, 539.73 and 260.28 is: 359.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.23 : 539.73 = 260.28 : x
  2. Step 2: Convert to fraction form
    391.23/539.73 = 260.28/x
  3. Step 3: Cross multiply
    391.23x = 539.73 × 260.28
  4. Step 4: Simplify right side
    391.23x = 140,480.92
  5. Step 5: Solve for x
    x = 140,480.92/391.23
  6. Step 6: Final answer
    x = 359.08

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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.