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Finding the Fourth Proportional to 674.71, 930.99 and 391.03

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Solution

The fourth proportional to 674.71, 930.99 and 391.03 is: 539.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.71 : 930.99 = 391.03 : x
  2. Step 2: Convert to fraction form
    674.71/930.99 = 391.03/x
  3. Step 3: Cross multiply
    674.71x = 930.99 × 391.03
  4. Step 4: Simplify right side
    674.71x = 364,042.69
  5. Step 5: Solve for x
    x = 364,042.69/674.71
  6. Step 6: Final answer
    x = 539.55

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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.