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Finding the Fourth Proportional to 20,863.92, 28,787.06 and 12,368.03

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Solution

The fourth proportional to 20,863.92, 28,787.06 and 12,368.03 is: 17,064.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,863.92 : 28,787.06 = 12,368.03 : x
  2. Step 2: Convert to fraction form
    20,863.92/28,787.06 = 12,368.03/x
  3. Step 3: Cross multiply
    20,863.92x = 28,787.06 × 12,368.03
  4. Step 4: Simplify right side
    20,863.92x = 356,039,221.69
  5. Step 5: Solve for x
    x = 356,039,221.69/20,863.92
  6. Step 6: Final answer
    x = 17,064.83

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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.