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Finding the Fourth Proportional to 18,764.87, 28,123.00 and 7,658.85

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Solution

The fourth proportional to 18,764.87, 28,123.00 and 7,658.85 is: 11,478.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,764.87 : 28,123.00 = 7,658.85 : x
  2. Step 2: Convert to fraction form
    18,764.87/28,123.00 = 7,658.85/x
  3. Step 3: Cross multiply
    18,764.87x = 28,123.00 × 7,658.85
  4. Step 4: Simplify right side
    18,764.87x = 215,389,924.86
  5. Step 5: Solve for x
    x = 215,389,924.86/18,764.87
  6. Step 6: Final answer
    x = 11,478.36

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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.