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Finding the Fourth Proportional to 1,243.47, 1,863.99 and 696.12

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Solution

The fourth proportional to 1,243.47, 1,863.99 and 696.12 is: 1,043.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.47 : 1,863.99 = 696.12 : x
  2. Step 2: Convert to fraction form
    1,243.47/1,863.99 = 696.12/x
  3. Step 3: Cross multiply
    1,243.47x = 1,863.99 × 696.12
  4. Step 4: Simplify right side
    1,243.47x = 1,297,560.72
  5. Step 5: Solve for x
    x = 1,297,560.72/1,243.47
  6. Step 6: Final answer
    x = 1,043.50

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.