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Finding the Fourth Proportional to 15,311.22, 21,129.48 and 8,942.22

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Solution

The fourth proportional to 15,311.22, 21,129.48 and 8,942.22 is: 12,340.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,311.22 : 21,129.48 = 8,942.22 : x
  2. Step 2: Convert to fraction form
    15,311.22/21,129.48 = 8,942.22/x
  3. Step 3: Cross multiply
    15,311.22x = 21,129.48 × 8,942.22
  4. Step 4: Simplify right side
    15,311.22x = 188,944,458.65
  5. Step 5: Solve for x
    x = 188,944,458.65/15,311.22
  6. Step 6: Final answer
    x = 12,340.26

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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.