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Finding the Fourth Proportional to 615.38, 849.20 and 353.38

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Solution

The fourth proportional to 615.38, 849.20 and 353.38 is: 487.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.38 : 849.20 = 353.38 : x
  2. Step 2: Convert to fraction form
    615.38/849.20 = 353.38/x
  3. Step 3: Cross multiply
    615.38x = 849.20 × 353.38
  4. Step 4: Simplify right side
    615.38x = 300,086.05
  5. Step 5: Solve for x
    x = 300,086.05/615.38
  6. Step 6: Final answer
    x = 487.64

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Double scale
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1.5x scale

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.