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Finding the Fourth Proportional to 12,079.20, 18,097.20 and 10,221.60

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Solution

The fourth proportional to 12,079.20, 18,097.20 and 10,221.60 is: 15,314.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,079.20 : 18,097.20 = 10,221.60 : x
  2. Step 2: Convert to fraction form
    12,079.20/18,097.20 = 10,221.60/x
  3. Step 3: Cross multiply
    12,079.20x = 18,097.20 × 10,221.60
  4. Step 4: Simplify right side
    12,079.20x = 184,982,339.52
  5. Step 5: Solve for x
    x = 184,982,339.52/12,079.20
  6. Step 6: Final answer
    x = 15,314.12

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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.