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Finding the Fourth Proportional to 753.92, 1,039.68 and 644.48

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Solution

The fourth proportional to 753.92, 1,039.68 and 644.48 is: 888.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.92 : 1,039.68 = 644.48 : x
  2. Step 2: Convert to fraction form
    753.92/1,039.68 = 644.48/x
  3. Step 3: Cross multiply
    753.92x = 1,039.68 × 644.48
  4. Step 4: Simplify right side
    753.92x = 670,052.97
  5. Step 5: Solve for x
    x = 670,052.97/753.92
  6. Step 6: Final answer
    x = 888.76

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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.