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Finding the Fourth Proportional to 18,928.87, 28,397.79 and 5,780.41

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Solution

The fourth proportional to 18,928.87, 28,397.79 and 5,780.41 is: 8,671.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.87 : 28,397.79 = 5,780.41 : x
  2. Step 2: Convert to fraction form
    18,928.87/28,397.79 = 5,780.41/x
  3. Step 3: Cross multiply
    18,928.87x = 28,397.79 × 5,780.41
  4. Step 4: Simplify right side
    18,928.87x = 164,150,798.30
  5. Step 5: Solve for x
    x = 164,150,798.30/18,928.87
  6. Step 6: Final answer
    x = 8,671.98

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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.