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Finding the Fourth Proportional to 801.92, 1,105.44 and 644.24

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Solution

The fourth proportional to 801.92, 1,105.44 and 644.24 is: 888.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.92 : 1,105.44 = 644.24 : x
  2. Step 2: Convert to fraction form
    801.92/1,105.44 = 644.24/x
  3. Step 3: Cross multiply
    801.92x = 1,105.44 × 644.24
  4. Step 4: Simplify right side
    801.92x = 712,168.67
  5. Step 5: Solve for x
    x = 712,168.67/801.92
  6. Step 6: Final answer
    x = 888.08

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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.