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Finding the Fourth Proportional to 12,808.20, 19,212.30 and 10,839.90

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Solution

The fourth proportional to 12,808.20, 19,212.30 and 10,839.90 is: 16,259.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,808.20 : 19,212.30 = 10,839.90 : x
  2. Step 2: Convert to fraction form
    12,808.20/19,212.30 = 10,839.90/x
  3. Step 3: Cross multiply
    12,808.20x = 19,212.30 × 10,839.90
  4. Step 4: Simplify right side
    12,808.20x = 208,259,410.77
  5. Step 5: Solve for x
    x = 208,259,410.77/12,808.20
  6. Step 6: Final answer
    x = 16,259.85

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1.5x scale

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.