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Finding the Fourth Proportional to 10,314.80, 15,439.80 and 8,111.60

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Solution

The fourth proportional to 10,314.80, 15,439.80 and 8,111.60 is: 12,141.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,314.80 : 15,439.80 = 8,111.60 : x
  2. Step 2: Convert to fraction form
    10,314.80/15,439.80 = 8,111.60/x
  3. Step 3: Cross multiply
    10,314.80x = 15,439.80 × 8,111.60
  4. Step 4: Simplify right side
    10,314.80x = 125,241,481.68
  5. Step 5: Solve for x
    x = 125,241,481.68/10,314.80
  6. Step 6: Final answer
    x = 12,141.92

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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.