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Finding the Fourth Proportional to 771.91, 1,065.24 and 422.62

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Solution

The fourth proportional to 771.91, 1,065.24 and 422.62 is: 583.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.91 : 1,065.24 = 422.62 : x
  2. Step 2: Convert to fraction form
    771.91/1,065.24 = 422.62/x
  3. Step 3: Cross multiply
    771.91x = 1,065.24 × 422.62
  4. Step 4: Simplify right side
    771.91x = 450,191.73
  5. Step 5: Solve for x
    x = 450,191.73/771.91
  6. Step 6: Final answer
    x = 583.22

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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.