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Finding the Fourth Proportional to 969.38, 1,337.85 and 721.40

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Solution

The fourth proportional to 969.38, 1,337.85 and 721.40 is: 995.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.38 : 1,337.85 = 721.40 : x
  2. Step 2: Convert to fraction form
    969.38/1,337.85 = 721.40/x
  3. Step 3: Cross multiply
    969.38x = 1,337.85 × 721.40
  4. Step 4: Simplify right side
    969.38x = 965,118.30
  5. Step 5: Solve for x
    x = 965,118.30/969.38
  6. Step 6: Final answer
    x = 995.61

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Double scale
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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.