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Finding the Fourth Proportional to 969.68, 1,338.15 and 638.29

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Solution

The fourth proportional to 969.68, 1,338.15 and 638.29 is: 880.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.68 : 1,338.15 = 638.29 : x
  2. Step 2: Convert to fraction form
    969.68/1,338.15 = 638.29/x
  3. Step 3: Cross multiply
    969.68x = 1,338.15 × 638.29
  4. Step 4: Simplify right side
    969.68x = 854,131.83
  5. Step 5: Solve for x
    x = 854,131.83/969.68
  6. Step 6: Final answer
    x = 880.84

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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.