Home / 21,221-31,607.34-20,110.76

Finding the Fourth Proportional to 21,221, 31,607.34 and 20,110.76

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Solution

The fourth proportional to 21,221, 31,607.34 and 20,110.76 is: 29,953.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,221 : 31,607.34 = 20,110.76 : x
  2. Step 2: Convert to fraction form
    21,221/31,607.34 = 20,110.76/x
  3. Step 3: Cross multiply
    21,221x = 31,607.34 × 20,110.76
  4. Step 4: Simplify right side
    21,221x = 635,647,628.98
  5. Step 5: Solve for x
    x = 635,647,628.98/21,221
  6. Step 6: Final answer
    x = 29,953.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.