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Finding the Fourth Proportional to 12,808.80, 19,213.20 and 6,903.90

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Solution

The fourth proportional to 12,808.80, 19,213.20 and 6,903.90 is: 10,355.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,808.80 : 19,213.20 = 6,903.90 : x
  2. Step 2: Convert to fraction form
    12,808.80/19,213.20 = 6,903.90/x
  3. Step 3: Cross multiply
    12,808.80x = 19,213.20 × 6,903.90
  4. Step 4: Simplify right side
    12,808.80x = 132,646,011.48
  5. Step 5: Solve for x
    x = 132,646,011.48/12,808.80
  6. Step 6: Final answer
    x = 10,355.85

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Half scale
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Double scale
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Similar ratio
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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.