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Finding the Fourth Proportional to 18,764.70, 28,110.60 and 12,859.80

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Solution

The fourth proportional to 18,764.70, 28,110.60 and 12,859.80 is: 19,264.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,764.70 : 28,110.60 = 12,859.80 : x
  2. Step 2: Convert to fraction form
    18,764.70/28,110.60 = 12,859.80/x
  3. Step 3: Cross multiply
    18,764.70x = 28,110.60 × 12,859.80
  4. Step 4: Simplify right side
    18,764.70x = 361,496,693.88
  5. Step 5: Solve for x
    x = 361,496,693.88/18,764.70
  6. Step 6: Final answer
    x = 19,264.72

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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.