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Finding the Fourth Proportional to 444.20, 611.56 and 391.68

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Solution

The fourth proportional to 444.20, 611.56 and 391.68 is: 539.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.20 : 611.56 = 391.68 : x
  2. Step 2: Convert to fraction form
    444.20/611.56 = 391.68/x
  3. Step 3: Cross multiply
    444.20x = 611.56 × 391.68
  4. Step 4: Simplify right side
    444.20x = 239,535.82
  5. Step 5: Solve for x
    x = 239,535.82/444.20
  6. Step 6: Final answer
    x = 539.25

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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.