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Finding the Fourth Proportional to 18,722.78, 28,064.50 and 7,473.71

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Solution

The fourth proportional to 18,722.78, 28,064.50 and 7,473.71 is: 11,202.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,722.78 : 28,064.50 = 7,473.71 : x
  2. Step 2: Convert to fraction form
    18,722.78/28,064.50 = 7,473.71/x
  3. Step 3: Cross multiply
    18,722.78x = 28,064.50 × 7,473.71
  4. Step 4: Simplify right side
    18,722.78x = 209,745,934.30
  5. Step 5: Solve for x
    x = 209,745,934.30/18,722.78
  6. Step 6: Final answer
    x = 11,202.71

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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.