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Finding the Fourth Proportional to 674.71, 931.85 and 665.61

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Solution

The fourth proportional to 674.71, 931.85 and 665.61 is: 919.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.71 : 931.85 = 665.61 : x
  2. Step 2: Convert to fraction form
    674.71/931.85 = 665.61/x
  3. Step 3: Cross multiply
    674.71x = 931.85 × 665.61
  4. Step 4: Simplify right side
    674.71x = 620,248.68
  5. Step 5: Solve for x
    x = 620,248.68/674.71
  6. Step 6: Final answer
    x = 919.28

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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.