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Finding the Fourth Proportional to 908.48, 1,256.22 and 721.64

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Solution

The fourth proportional to 908.48, 1,256.22 and 721.64 is: 997.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.48 : 1,256.22 = 721.64 : x
  2. Step 2: Convert to fraction form
    908.48/1,256.22 = 721.64/x
  3. Step 3: Cross multiply
    908.48x = 1,256.22 × 721.64
  4. Step 4: Simplify right side
    908.48x = 906,534.99
  5. Step 5: Solve for x
    x = 906,534.99/908.48
  6. Step 6: Final answer
    x = 997.86

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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.