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Finding the Fourth Proportional to 20,808.83, 28,718.85 and 11,859.55

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Solution

The fourth proportional to 20,808.83, 28,718.85 and 11,859.55 is: 16,367.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.83 : 28,718.85 = 11,859.55 : x
  2. Step 2: Convert to fraction form
    20,808.83/28,718.85 = 11,859.55/x
  3. Step 3: Cross multiply
    20,808.83x = 28,718.85 × 11,859.55
  4. Step 4: Simplify right side
    20,808.83x = 340,592,610.19
  5. Step 5: Solve for x
    x = 340,592,610.19/20,808.83
  6. Step 6: Final answer
    x = 16,367.69

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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.