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Finding the Fourth Proportional to 444.20, 611.58 and 391.70

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Solution

The fourth proportional to 444.20, 611.58 and 391.70 is: 539.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.20 : 611.58 = 391.70 : x
  2. Step 2: Convert to fraction form
    444.20/611.58 = 391.70/x
  3. Step 3: Cross multiply
    444.20x = 611.58 × 391.70
  4. Step 4: Simplify right side
    444.20x = 239,555.89
  5. Step 5: Solve for x
    x = 239,555.89/444.20
  6. Step 6: Final answer
    x = 539.30

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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.