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Finding the Fourth Proportional to 18,919.95, 28,379.85 and 5,772.28

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Solution

The fourth proportional to 18,919.95, 28,379.85 and 5,772.28 is: 8,658.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.95 : 28,379.85 = 5,772.28 : x
  2. Step 2: Convert to fraction form
    18,919.95/28,379.85 = 5,772.28/x
  3. Step 3: Cross multiply
    18,919.95x = 28,379.85 × 5,772.28
  4. Step 4: Simplify right side
    18,919.95x = 163,816,440.56
  5. Step 5: Solve for x
    x = 163,816,440.56/18,919.95
  6. Step 6: Final answer
    x = 8,658.40

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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.