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Finding the Fourth Proportional to 809.12, 1,115.28 and 745.52

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Solution

The fourth proportional to 809.12, 1,115.28 and 745.52 is: 1,027.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.12 : 1,115.28 = 745.52 : x
  2. Step 2: Convert to fraction form
    809.12/1,115.28 = 745.52/x
  3. Step 3: Cross multiply
    809.12x = 1,115.28 × 745.52
  4. Step 4: Simplify right side
    809.12x = 831,463.55
  5. Step 5: Solve for x
    x = 831,463.55/809.12
  6. Step 6: Final answer
    x = 1,027.61

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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.