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Finding the Fourth Proportional to 615.09, 849.11 and 405.27

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Solution

The fourth proportional to 615.09, 849.11 and 405.27 is: 559.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.09 : 849.11 = 405.27 : x
  2. Step 2: Convert to fraction form
    615.09/849.11 = 405.27/x
  3. Step 3: Cross multiply
    615.09x = 849.11 × 405.27
  4. Step 4: Simplify right side
    615.09x = 344,116.78
  5. Step 5: Solve for x
    x = 344,116.78/615.09
  6. Step 6: Final answer
    x = 559.46

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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.