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Finding the Fourth Proportional to 927.75, 1,391.78 and 379.79

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Solution

The fourth proportional to 927.75, 1,391.78 and 379.79 is: 569.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.75 : 1,391.78 = 379.79 : x
  2. Step 2: Convert to fraction form
    927.75/1,391.78 = 379.79/x
  3. Step 3: Cross multiply
    927.75x = 1,391.78 × 379.79
  4. Step 4: Simplify right side
    927.75x = 528,575.27
  5. Step 5: Solve for x
    x = 528,575.27/927.75
  6. Step 6: Final answer
    x = 569.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.