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Finding the Fourth Proportional to 15,195.36, 20,979.60 and 9,820.20

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Solution

The fourth proportional to 15,195.36, 20,979.60 and 9,820.20 is: 13,558.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,195.36 : 20,979.60 = 9,820.20 : x
  2. Step 2: Convert to fraction form
    15,195.36/20,979.60 = 9,820.20/x
  3. Step 3: Cross multiply
    15,195.36x = 20,979.60 × 9,820.20
  4. Step 4: Simplify right side
    15,195.36x = 206,023,867.92
  5. Step 5: Solve for x
    x = 206,023,867.92/15,195.36
  6. Step 6: Final answer
    x = 13,558.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.