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Finding the Fourth Proportional to 771.50, 1,064.69 and 422.21

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Solution

The fourth proportional to 771.50, 1,064.69 and 422.21 is: 582.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.50 : 1,064.69 = 422.21 : x
  2. Step 2: Convert to fraction form
    771.50/1,064.69 = 422.21/x
  3. Step 3: Cross multiply
    771.50x = 1,064.69 × 422.21
  4. Step 4: Simplify right side
    771.50x = 449,523.82
  5. Step 5: Solve for x
    x = 449,523.82/771.50
  6. Step 6: Final answer
    x = 582.66

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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.