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Finding the Fourth Proportional to 408.89, 615.89 and 372.55

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Solution

The fourth proportional to 408.89, 615.89 and 372.55 is: 561.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.89 : 615.89 = 372.55 : x
  2. Step 2: Convert to fraction form
    408.89/615.89 = 372.55/x
  3. Step 3: Cross multiply
    408.89x = 615.89 × 372.55
  4. Step 4: Simplify right side
    408.89x = 229,449.21
  5. Step 5: Solve for x
    x = 229,449.21/408.89
  6. Step 6: Final answer
    x = 561.16

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.