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Finding the Fourth Proportional to 969.58, 1,338.56 and 638.96

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Solution

The fourth proportional to 969.58, 1,338.56 and 638.96 is: 882.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.58 : 1,338.56 = 638.96 : x
  2. Step 2: Convert to fraction form
    969.58/1,338.56 = 638.96/x
  3. Step 3: Cross multiply
    969.58x = 1,338.56 × 638.96
  4. Step 4: Simplify right side
    969.58x = 855,286.30
  5. Step 5: Solve for x
    x = 855,286.30/969.58
  6. Step 6: Final answer
    x = 882.12

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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.