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Finding the Fourth Proportional to 674.78, 928.95 and 643.82

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Solution

The fourth proportional to 674.78, 928.95 and 643.82 is: 886.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.78 : 928.95 = 643.82 : x
  2. Step 2: Convert to fraction form
    674.78/928.95 = 643.82/x
  3. Step 3: Cross multiply
    674.78x = 928.95 × 643.82
  4. Step 4: Simplify right side
    674.78x = 598,076.59
  5. Step 5: Solve for x
    x = 598,076.59/674.78
  6. Step 6: Final answer
    x = 886.33

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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.