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Finding the Fourth Proportional to 1,631.38, 2,251.28 and 885.36

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Solution

The fourth proportional to 1,631.38, 2,251.28 and 885.36 is: 1,221.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,631.38 : 2,251.28 = 885.36 : x
  2. Step 2: Convert to fraction form
    1,631.38/2,251.28 = 885.36/x
  3. Step 3: Cross multiply
    1,631.38x = 2,251.28 × 885.36
  4. Step 4: Simplify right side
    1,631.38x = 1,993,193.26
  5. Step 5: Solve for x
    x = 1,993,193.26/1,631.38
  6. Step 6: Final answer
    x = 1,221.79

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Half scale
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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.