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Finding the Fourth Proportional to 615.44, 849.76 and 491.78

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Solution

The fourth proportional to 615.44, 849.76 and 491.78 is: 679.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.44 : 849.76 = 491.78 : x
  2. Step 2: Convert to fraction form
    615.44/849.76 = 491.78/x
  3. Step 3: Cross multiply
    615.44x = 849.76 × 491.78
  4. Step 4: Simplify right side
    615.44x = 417,894.97
  5. Step 5: Solve for x
    x = 417,894.97/615.44
  6. Step 6: Final answer
    x = 679.02

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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.