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Finding the Fourth Proportional to 15,991.20, 23,979.60 and 7,221.60

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Solution

The fourth proportional to 15,991.20, 23,979.60 and 7,221.60 is: 10,829.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,991.20 : 23,979.60 = 7,221.60 : x
  2. Step 2: Convert to fraction form
    15,991.20/23,979.60 = 7,221.60/x
  3. Step 3: Cross multiply
    15,991.20x = 23,979.60 × 7,221.60
  4. Step 4: Simplify right side
    15,991.20x = 173,171,079.36
  5. Step 5: Solve for x
    x = 173,171,079.36/15,991.20
  6. Step 6: Final answer
    x = 10,829.15

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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.