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Finding the Fourth Proportional to 921.79, 1,269.61 and 797.46

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Solution

The fourth proportional to 921.79, 1,269.61 and 797.46 is: 1,098.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.79 : 1,269.61 = 797.46 : x
  2. Step 2: Convert to fraction form
    921.79/1,269.61 = 797.46/x
  3. Step 3: Cross multiply
    921.79x = 1,269.61 × 797.46
  4. Step 4: Simplify right side
    921.79x = 1,012,456.44
  5. Step 5: Solve for x
    x = 1,012,456.44/921.79
  6. Step 6: Final answer
    x = 1,098.36

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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.