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Finding the Fourth Proportional to 15,790.50, 21,789.86 and 8,716.86

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Solution

The fourth proportional to 15,790.50, 21,789.86 and 8,716.86 is: 12,028.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.50 : 21,789.86 = 8,716.86 : x
  2. Step 2: Convert to fraction form
    15,790.50/21,789.86 = 8,716.86/x
  3. Step 3: Cross multiply
    15,790.50x = 21,789.86 × 8,716.86
  4. Step 4: Simplify right side
    15,790.50x = 189,939,115.46
  5. Step 5: Solve for x
    x = 189,939,115.46/15,790.50
  6. Step 6: Final answer
    x = 12,028.70

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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.