Home / 12,511.20-18,741.60-7,816.80

Finding the Fourth Proportional to 12,511.20, 18,741.60 and 7,816.80

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Solution

The fourth proportional to 12,511.20, 18,741.60 and 7,816.80 is: 11,709.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,511.20 : 18,741.60 = 7,816.80 : x
  2. Step 2: Convert to fraction form
    12,511.20/18,741.60 = 7,816.80/x
  3. Step 3: Cross multiply
    12,511.20x = 18,741.60 × 7,816.80
  4. Step 4: Simplify right side
    12,511.20x = 146,499,338.88
  5. Step 5: Solve for x
    x = 146,499,338.88/12,511.20
  6. Step 6: Final answer
    x = 11,709.46

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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.