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Finding the Fourth Proportional to 13,812.80, 20,719.20 and 7,907.90

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Solution

The fourth proportional to 13,812.80, 20,719.20 and 7,907.90 is: 11,861.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,812.80 : 20,719.20 = 7,907.90 : x
  2. Step 2: Convert to fraction form
    13,812.80/20,719.20 = 7,907.90/x
  3. Step 3: Cross multiply
    13,812.80x = 20,719.20 × 7,907.90
  4. Step 4: Simplify right side
    13,812.80x = 163,845,361.68
  5. Step 5: Solve for x
    x = 163,845,361.68/13,812.80
  6. Step 6: Final answer
    x = 11,861.85

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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.