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Finding the Fourth Proportional to 615.38, 850.04 and 491.90

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Solution

The fourth proportional to 615.38, 850.04 and 491.90 is: 679.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.38 : 850.04 = 491.90 : x
  2. Step 2: Convert to fraction form
    615.38/850.04 = 491.90/x
  3. Step 3: Cross multiply
    615.38x = 850.04 × 491.90
  4. Step 4: Simplify right side
    615.38x = 418,131.66
  5. Step 5: Solve for x
    x = 418,131.66/615.38
  6. Step 6: Final answer
    x = 679.47

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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.