Home / 21,161.42-31,743.69-7,121.39

Finding the Fourth Proportional to 21,161.42, 31,743.69 and 7,121.39

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Solution

The fourth proportional to 21,161.42, 31,743.69 and 7,121.39 is: 10,682.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,161.42 : 31,743.69 = 7,121.39 : x
  2. Step 2: Convert to fraction form
    21,161.42/31,743.69 = 7,121.39/x
  3. Step 3: Cross multiply
    21,161.42x = 31,743.69 × 7,121.39
  4. Step 4: Simplify right side
    21,161.42x = 226,059,037.81
  5. Step 5: Solve for x
    x = 226,059,037.81/21,161.42
  6. Step 6: Final answer
    x = 10,682.61

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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.