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Finding the Fourth Proportional to 671.81, 927.20 and 409.78

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Solution

The fourth proportional to 671.81, 927.20 and 409.78 is: 565.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.81 : 927.20 = 409.78 : x
  2. Step 2: Convert to fraction form
    671.81/927.20 = 409.78/x
  3. Step 3: Cross multiply
    671.81x = 927.20 × 409.78
  4. Step 4: Simplify right side
    671.81x = 379,946.72
  5. Step 5: Solve for x
    x = 379,946.72/671.81
  6. Step 6: Final answer
    x = 565.55

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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.