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Finding the Fourth Proportional to 801.11, 1,105.56 and 486.38

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Solution

The fourth proportional to 801.11, 1,105.56 and 486.38 is: 671.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.11 : 1,105.56 = 486.38 : x
  2. Step 2: Convert to fraction form
    801.11/1,105.56 = 486.38/x
  3. Step 3: Cross multiply
    801.11x = 1,105.56 × 486.38
  4. Step 4: Simplify right side
    801.11x = 537,722.27
  5. Step 5: Solve for x
    x = 537,722.27/801.11
  6. Step 6: Final answer
    x = 671.22

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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.