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Finding the Fourth Proportional to 410.81, 615.77 and 205.55

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Solution

The fourth proportional to 410.81, 615.77 and 205.55 is: 308.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.81 : 615.77 = 205.55 : x
  2. Step 2: Convert to fraction form
    410.81/615.77 = 205.55/x
  3. Step 3: Cross multiply
    410.81x = 615.77 × 205.55
  4. Step 4: Simplify right side
    410.81x = 126,572.04
  5. Step 5: Solve for x
    x = 126,572.04/410.81
  6. Step 6: Final answer
    x = 308.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.