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Finding the Fourth Proportional to 969.94, 1,338.81 and 659.62

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Solution

The fourth proportional to 969.94, 1,338.81 and 659.62 is: 910.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.94 : 1,338.81 = 659.62 : x
  2. Step 2: Convert to fraction form
    969.94/1,338.81 = 659.62/x
  3. Step 3: Cross multiply
    969.94x = 1,338.81 × 659.62
  4. Step 4: Simplify right side
    969.94x = 883,105.85
  5. Step 5: Solve for x
    x = 883,105.85/969.94
  6. Step 6: Final answer
    x = 910.47

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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.