Home / 21,251.09-31,890.68-21,086.93

Finding the Fourth Proportional to 21,251.09, 31,890.68 and 21,086.93

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Solution

The fourth proportional to 21,251.09, 31,890.68 and 21,086.93 is: 31,644.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,251.09 : 31,890.68 = 21,086.93 : x
  2. Step 2: Convert to fraction form
    21,251.09/31,890.68 = 21,086.93/x
  3. Step 3: Cross multiply
    21,251.09x = 31,890.68 × 21,086.93
  4. Step 4: Simplify right side
    21,251.09x = 672,476,536.81
  5. Step 5: Solve for x
    x = 672,476,536.81/21,251.09
  6. Step 6: Final answer
    x = 31,644.33

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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.