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Finding the Fourth Proportional to 12,812.80, 19,219.20 and 6,907.90

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Solution

The fourth proportional to 12,812.80, 19,219.20 and 6,907.90 is: 10,361.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,812.80 : 19,219.20 = 6,907.90 : x
  2. Step 2: Convert to fraction form
    12,812.80/19,219.20 = 6,907.90/x
  3. Step 3: Cross multiply
    12,812.80x = 19,219.20 × 6,907.90
  4. Step 4: Simplify right side
    12,812.80x = 132,764,311.68
  5. Step 5: Solve for x
    x = 132,764,311.68/12,812.80
  6. Step 6: Final answer
    x = 10,361.85

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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.