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Finding the Fourth Proportional to 921.67, 1,269.92 and 626.42

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Solution

The fourth proportional to 921.67, 1,269.92 and 626.42 is: 863.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.67 : 1,269.92 = 626.42 : x
  2. Step 2: Convert to fraction form
    921.67/1,269.92 = 626.42/x
  3. Step 3: Cross multiply
    921.67x = 1,269.92 × 626.42
  4. Step 4: Simplify right side
    921.67x = 795,508.03
  5. Step 5: Solve for x
    x = 795,508.03/921.67
  6. Step 6: Final answer
    x = 863.12

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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.