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Finding the Fourth Proportional to 801.40, 1,106 and 447.28

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Solution

The fourth proportional to 801.40, 1,106 and 447.28 is: 617.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.40 : 1,106 = 447.28 : x
  2. Step 2: Convert to fraction form
    801.40/1,106 = 447.28/x
  3. Step 3: Cross multiply
    801.40x = 1,106 × 447.28
  4. Step 4: Simplify right side
    801.40x = 494,691.68
  5. Step 5: Solve for x
    x = 494,691.68/801.40
  6. Step 6: Final answer
    x = 617.28

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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.