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Finding the Fourth Proportional to 18,919.72, 28,370.78 and 5,773.48

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Solution

The fourth proportional to 18,919.72, 28,370.78 and 5,773.48 is: 8,657.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.72 : 28,370.78 = 5,773.48 : x
  2. Step 2: Convert to fraction form
    18,919.72/28,370.78 = 5,773.48/x
  3. Step 3: Cross multiply
    18,919.72x = 28,370.78 × 5,773.48
  4. Step 4: Simplify right side
    18,919.72x = 163,798,130.91
  5. Step 5: Solve for x
    x = 163,798,130.91/18,919.72
  6. Step 6: Final answer
    x = 8,657.53

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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.