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Finding the Fourth Proportional to 969.27, 1,338.30 and 638.66

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Solution

The fourth proportional to 969.27, 1,338.30 and 638.66 is: 881.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.27 : 1,338.30 = 638.66 : x
  2. Step 2: Convert to fraction form
    969.27/1,338.30 = 638.66/x
  3. Step 3: Cross multiply
    969.27x = 1,338.30 × 638.66
  4. Step 4: Simplify right side
    969.27x = 854,711.99
  5. Step 5: Solve for x
    x = 854,711.99/969.27
  6. Step 6: Final answer
    x = 881.81

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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.