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Finding the Fourth Proportional to 15,198.72, 20,976.32 and 8,913.12

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Solution

The fourth proportional to 15,198.72, 20,976.32 and 8,913.12 is: 12,301.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,198.72 : 20,976.32 = 8,913.12 : x
  2. Step 2: Convert to fraction form
    15,198.72/20,976.32 = 8,913.12/x
  3. Step 3: Cross multiply
    15,198.72x = 20,976.32 × 8,913.12
  4. Step 4: Simplify right side
    15,198.72x = 186,964,457.32
  5. Step 5: Solve for x
    x = 186,964,457.32/15,198.72
  6. Step 6: Final answer
    x = 12,301.33

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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.