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Finding the Fourth Proportional to 801.49, 1,105.72 and 491.17

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Solution

The fourth proportional to 801.49, 1,105.72 and 491.17 is: 677.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.49 : 1,105.72 = 491.17 : x
  2. Step 2: Convert to fraction form
    801.49/1,105.72 = 491.17/x
  3. Step 3: Cross multiply
    801.49x = 1,105.72 × 491.17
  4. Step 4: Simplify right side
    801.49x = 543,096.49
  5. Step 5: Solve for x
    x = 543,096.49/801.49
  6. Step 6: Final answer
    x = 677.61

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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.