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Finding the Fourth Proportional to 816.12, 1,226.61 and 755.78

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Solution

The fourth proportional to 816.12, 1,226.61 and 755.78 is: 1,135.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.12 : 1,226.61 = 755.78 : x
  2. Step 2: Convert to fraction form
    816.12/1,226.61 = 755.78/x
  3. Step 3: Cross multiply
    816.12x = 1,226.61 × 755.78
  4. Step 4: Simplify right side
    816.12x = 927,041.17
  5. Step 5: Solve for x
    x = 927,041.17/816.12
  6. Step 6: Final answer
    x = 1,135.91

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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.