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Finding the Fourth Proportional to 20,859.74, 28,782.12 and 11,910.15

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Solution

The fourth proportional to 20,859.74, 28,782.12 and 11,910.15 is: 16,433.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.74 : 28,782.12 = 11,910.15 : x
  2. Step 2: Convert to fraction form
    20,859.74/28,782.12 = 11,910.15/x
  3. Step 3: Cross multiply
    20,859.74x = 28,782.12 × 11,910.15
  4. Step 4: Simplify right side
    20,859.74x = 342,799,366.52
  5. Step 5: Solve for x
    x = 342,799,366.52/20,859.74
  6. Step 6: Final answer
    x = 16,433.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.