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Finding the Fourth Proportional to 771.57, 1,064.78 and 422.25

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Solution

The fourth proportional to 771.57, 1,064.78 and 422.25 is: 582.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.57 : 1,064.78 = 422.25 : x
  2. Step 2: Convert to fraction form
    771.57/1,064.78 = 422.25/x
  3. Step 3: Cross multiply
    771.57x = 1,064.78 × 422.25
  4. Step 4: Simplify right side
    771.57x = 449,601.24
  5. Step 5: Solve for x
    x = 449,601.24/771.57
  6. Step 6: Final answer
    x = 582.71

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1.5x scale

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.