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Finding the Fourth Proportional to 801.18, 1,105.65 and 490.50

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Solution

The fourth proportional to 801.18, 1,105.65 and 490.50 is: 676.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.18 : 1,105.65 = 490.50 : x
  2. Step 2: Convert to fraction form
    801.18/1,105.65 = 490.50/x
  3. Step 3: Cross multiply
    801.18x = 1,105.65 × 490.50
  4. Step 4: Simplify right side
    801.18x = 542,321.33
  5. Step 5: Solve for x
    x = 542,321.33/801.18
  6. Step 6: Final answer
    x = 676.90

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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.