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Finding the Fourth Proportional to 907.28, 1,251.96 and 721.22

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Solution

The fourth proportional to 907.28, 1,251.96 and 721.22 is: 995.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.28 : 1,251.96 = 721.22 : x
  2. Step 2: Convert to fraction form
    907.28/1,251.96 = 721.22/x
  3. Step 3: Cross multiply
    907.28x = 1,251.96 × 721.22
  4. Step 4: Simplify right side
    907.28x = 902,938.59
  5. Step 5: Solve for x
    x = 902,938.59/907.28
  6. Step 6: Final answer
    x = 995.21

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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.