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Finding the Fourth Proportional to 674.91, 931.41 and 391.41

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Solution

The fourth proportional to 674.91, 931.41 and 391.41 is: 540.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.91 : 931.41 = 391.41 : x
  2. Step 2: Convert to fraction form
    674.91/931.41 = 391.41/x
  3. Step 3: Cross multiply
    674.91x = 931.41 × 391.41
  4. Step 4: Simplify right side
    674.91x = 364,563.19
  5. Step 5: Solve for x
    x = 364,563.19/674.91
  6. Step 6: Final answer
    x = 540.17

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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.