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Finding the Fourth Proportional to 996.24, 1,377.21 and 913.21

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Solution

The fourth proportional to 996.24, 1,377.21 and 913.21 is: 1,262.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.24 : 1,377.21 = 913.21 : x
  2. Step 2: Convert to fraction form
    996.24/1,377.21 = 913.21/x
  3. Step 3: Cross multiply
    996.24x = 1,377.21 × 913.21
  4. Step 4: Simplify right side
    996.24x = 1,257,681.94
  5. Step 5: Solve for x
    x = 1,257,681.94/996.24
  6. Step 6: Final answer
    x = 1,262.44

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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.