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Finding the Fourth Proportional to 771.89, 1,065.21 and 422.57

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Solution

The fourth proportional to 771.89, 1,065.21 and 422.57 is: 583.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.89 : 1,065.21 = 422.57 : x
  2. Step 2: Convert to fraction form
    771.89/1,065.21 = 422.57/x
  3. Step 3: Cross multiply
    771.89x = 1,065.21 × 422.57
  4. Step 4: Simplify right side
    771.89x = 450,123.68
  5. Step 5: Solve for x
    x = 450,123.68/771.89
  6. Step 6: Final answer
    x = 583.15

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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.