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Finding the Fourth Proportional to 18,906.70, 28,364.28 and 5,760.10

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Solution

The fourth proportional to 18,906.70, 28,364.28 and 5,760.10 is: 8,641.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,906.70 : 28,364.28 = 5,760.10 : x
  2. Step 2: Convert to fraction form
    18,906.70/28,364.28 = 5,760.10/x
  3. Step 3: Cross multiply
    18,906.70x = 28,364.28 × 5,760.10
  4. Step 4: Simplify right side
    18,906.70x = 163,380,947.41
  5. Step 5: Solve for x
    x = 163,380,947.41/18,906.70
  6. Step 6: Final answer
    x = 8,641.43

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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.