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Finding the Fourth Proportional to 18,759.75, 28,143.42 and 8,371.50

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Solution

The fourth proportional to 18,759.75, 28,143.42 and 8,371.50 is: 12,558.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,759.75 : 28,143.42 = 8,371.50 : x
  2. Step 2: Convert to fraction form
    18,759.75/28,143.42 = 8,371.50/x
  3. Step 3: Cross multiply
    18,759.75x = 28,143.42 × 8,371.50
  4. Step 4: Simplify right side
    18,759.75x = 235,602,640.53
  5. Step 5: Solve for x
    x = 235,602,640.53/18,759.75
  6. Step 6: Final answer
    x = 12,558.94

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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.