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Finding the Fourth Proportional to 615.68, 849.44 and 408.72

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Solution

The fourth proportional to 615.68, 849.44 and 408.72 is: 563.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.68 : 849.44 = 408.72 : x
  2. Step 2: Convert to fraction form
    615.68/849.44 = 408.72/x
  3. Step 3: Cross multiply
    615.68x = 849.44 × 408.72
  4. Step 4: Simplify right side
    615.68x = 347,183.12
  5. Step 5: Solve for x
    x = 347,183.12/615.68
  6. Step 6: Final answer
    x = 563.90

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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.