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Finding the Fourth Proportional to 772.17, 1,065.57 and 422.85

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Solution

The fourth proportional to 772.17, 1,065.57 and 422.85 is: 583.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.17 : 1,065.57 = 422.85 : x
  2. Step 2: Convert to fraction form
    772.17/1,065.57 = 422.85/x
  3. Step 3: Cross multiply
    772.17x = 1,065.57 × 422.85
  4. Step 4: Simplify right side
    772.17x = 450,576.27
  5. Step 5: Solve for x
    x = 450,576.27/772.17
  6. Step 6: Final answer
    x = 583.52

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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.