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Finding the Fourth Proportional to 969.30, 1,338.76 and 639.23

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Solution

The fourth proportional to 969.30, 1,338.76 and 639.23 is: 882.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.30 : 1,338.76 = 639.23 : x
  2. Step 2: Convert to fraction form
    969.30/1,338.76 = 639.23/x
  3. Step 3: Cross multiply
    969.30x = 1,338.76 × 639.23
  4. Step 4: Simplify right side
    969.30x = 855,769.66
  5. Step 5: Solve for x
    x = 855,769.66/969.30
  6. Step 6: Final answer
    x = 882.87

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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.