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Finding the Fourth Proportional to 615.45, 849.11 and 394.53

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Solution

The fourth proportional to 615.45, 849.11 and 394.53 is: 544.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.45 : 849.11 = 394.53 : x
  2. Step 2: Convert to fraction form
    615.45/849.11 = 394.53/x
  3. Step 3: Cross multiply
    615.45x = 849.11 × 394.53
  4. Step 4: Simplify right side
    615.45x = 334,995.69
  5. Step 5: Solve for x
    x = 334,995.69/615.45
  6. Step 6: Final answer
    x = 544.31

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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.