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Finding the Fourth Proportional to 674.40, 932.40 and 663.92

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Solution

The fourth proportional to 674.40, 932.40 and 663.92 is: 917.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.40 : 932.40 = 663.92 : x
  2. Step 2: Convert to fraction form
    674.40/932.40 = 663.92/x
  3. Step 3: Cross multiply
    674.40x = 932.40 × 663.92
  4. Step 4: Simplify right side
    674.40x = 619,039.01
  5. Step 5: Solve for x
    x = 619,039.01/674.40
  6. Step 6: Final answer
    x = 917.91

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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.