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Finding the Fourth Proportional to 801.45, 1,105.79 and 469.80

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Solution

The fourth proportional to 801.45, 1,105.79 and 469.80 is: 648.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.45 : 1,105.79 = 469.80 : x
  2. Step 2: Convert to fraction form
    801.45/1,105.79 = 469.80/x
  3. Step 3: Cross multiply
    801.45x = 1,105.79 × 469.80
  4. Step 4: Simplify right side
    801.45x = 519,497.79
  5. Step 5: Solve for x
    x = 519,497.79/801.45
  6. Step 6: Final answer
    x = 648.20

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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.