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Finding the Fourth Proportional to 674.48, 930.75 and 379.78

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Solution

The fourth proportional to 674.48, 930.75 and 379.78 is: 524.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.48 : 930.75 = 379.78 : x
  2. Step 2: Convert to fraction form
    674.48/930.75 = 379.78/x
  3. Step 3: Cross multiply
    674.48x = 930.75 × 379.78
  4. Step 4: Simplify right side
    674.48x = 353,480.24
  5. Step 5: Solve for x
    x = 353,480.24/674.48
  6. Step 6: Final answer
    x = 524.08

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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.