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Finding the Fourth Proportional to 615.84, 849.92 and 394.80

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Solution

The fourth proportional to 615.84, 849.92 and 394.80 is: 544.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.84 : 849.92 = 394.80 : x
  2. Step 2: Convert to fraction form
    615.84/849.92 = 394.80/x
  3. Step 3: Cross multiply
    615.84x = 849.92 × 394.80
  4. Step 4: Simplify right side
    615.84x = 335,548.42
  5. Step 5: Solve for x
    x = 335,548.42/615.84
  6. Step 6: Final answer
    x = 544.86

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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.