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Finding the Fourth Proportional to 12,863.76, 19,295.28 and 4,099.20

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Solution

The fourth proportional to 12,863.76, 19,295.28 and 4,099.20 is: 6,148.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,863.76 : 19,295.28 = 4,099.20 : x
  2. Step 2: Convert to fraction form
    12,863.76/19,295.28 = 4,099.20/x
  3. Step 3: Cross multiply
    12,863.76x = 19,295.28 × 4,099.20
  4. Step 4: Simplify right side
    12,863.76x = 79,095,211.78
  5. Step 5: Solve for x
    x = 79,095,211.78/12,863.76
  6. Step 6: Final answer
    x = 6,148.69

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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.