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Finding the Fourth Proportional to 801.32, 1,105.78 and 469.78

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Solution

The fourth proportional to 801.32, 1,105.78 and 469.78 is: 648.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.32 : 1,105.78 = 469.78 : x
  2. Step 2: Convert to fraction form
    801.32/1,105.78 = 469.78/x
  3. Step 3: Cross multiply
    801.32x = 1,105.78 × 469.78
  4. Step 4: Simplify right side
    801.32x = 519,473.33
  5. Step 5: Solve for x
    x = 519,473.33/801.32
  6. Step 6: Final answer
    x = 648.27

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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.