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Finding the Fourth Proportional to 615.48, 849.42 and 391.38

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Solution

The fourth proportional to 615.48, 849.42 and 391.38 is: 540.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.48 : 849.42 = 391.38 : x
  2. Step 2: Convert to fraction form
    615.48/849.42 = 391.38/x
  3. Step 3: Cross multiply
    615.48x = 849.42 × 391.38
  4. Step 4: Simplify right side
    615.48x = 332,446.00
  5. Step 5: Solve for x
    x = 332,446.00/615.48
  6. Step 6: Final answer
    x = 540.14

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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.