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Finding the Fourth Proportional to 771.22, 1,063.29 and 630.82

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Solution

The fourth proportional to 771.22, 1,063.29 and 630.82 is: 869.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.22 : 1,063.29 = 630.82 : x
  2. Step 2: Convert to fraction form
    771.22/1,063.29 = 630.82/x
  3. Step 3: Cross multiply
    771.22x = 1,063.29 × 630.82
  4. Step 4: Simplify right side
    771.22x = 670,744.60
  5. Step 5: Solve for x
    x = 670,744.60/771.22
  6. Step 6: Final answer
    x = 869.72

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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.