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Finding the Fourth Proportional to 12,277.20, 18,415.80 and 7,899.60

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Solution

The fourth proportional to 12,277.20, 18,415.80 and 7,899.60 is: 11,849.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,277.20 : 18,415.80 = 7,899.60 : x
  2. Step 2: Convert to fraction form
    12,277.20/18,415.80 = 7,899.60/x
  3. Step 3: Cross multiply
    12,277.20x = 18,415.80 × 7,899.60
  4. Step 4: Simplify right side
    12,277.20x = 145,477,453.68
  5. Step 5: Solve for x
    x = 145,477,453.68/12,277.20
  6. Step 6: Final answer
    x = 11,849.40

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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.