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Finding the Fourth Proportional to 615.47, 849.08 and 405.38

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Solution

The fourth proportional to 615.47, 849.08 and 405.38 is: 559.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.47 : 849.08 = 405.38 : x
  2. Step 2: Convert to fraction form
    615.47/849.08 = 405.38/x
  3. Step 3: Cross multiply
    615.47x = 849.08 × 405.38
  4. Step 4: Simplify right side
    615.47x = 344,193.78
  5. Step 5: Solve for x
    x = 344,193.78/615.47
  6. Step 6: Final answer
    x = 559.24

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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.