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Finding the Fourth Proportional to 15,103.19, 20,840.87 and 8,819.21

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Solution

The fourth proportional to 15,103.19, 20,840.87 and 8,819.21 is: 12,169.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,103.19 : 20,840.87 = 8,819.21 : x
  2. Step 2: Convert to fraction form
    15,103.19/20,840.87 = 8,819.21/x
  3. Step 3: Cross multiply
    15,103.19x = 20,840.87 × 8,819.21
  4. Step 4: Simplify right side
    15,103.19x = 183,799,926.96
  5. Step 5: Solve for x
    x = 183,799,926.96/15,103.19
  6. Step 6: Final answer
    x = 12,169.61

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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.