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Finding the Fourth Proportional to 443.61, 611.55 and 391.41

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Solution

The fourth proportional to 443.61, 611.55 and 391.41 is: 539.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.61 : 611.55 = 391.41 : x
  2. Step 2: Convert to fraction form
    443.61/611.55 = 391.41/x
  3. Step 3: Cross multiply
    443.61x = 611.55 × 391.41
  4. Step 4: Simplify right side
    443.61x = 239,366.79
  5. Step 5: Solve for x
    x = 239,366.79/443.61
  6. Step 6: Final answer
    x = 539.59

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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.