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Finding the Fourth Proportional to 921.22, 1,384.60 and 759.96

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Solution

The fourth proportional to 921.22, 1,384.60 and 759.96 is: 1,142.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.22 : 1,384.60 = 759.96 : x
  2. Step 2: Convert to fraction form
    921.22/1,384.60 = 759.96/x
  3. Step 3: Cross multiply
    921.22x = 1,384.60 × 759.96
  4. Step 4: Simplify right side
    921.22x = 1,052,240.62
  5. Step 5: Solve for x
    x = 1,052,240.62/921.22
  6. Step 6: Final answer
    x = 1,142.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.