Home / 21,271.68-31,903.25-20,217.87

Finding the Fourth Proportional to 21,271.68, 31,903.25 and 20,217.87

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Solution

The fourth proportional to 21,271.68, 31,903.25 and 20,217.87 is: 30,322.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,271.68 : 31,903.25 = 20,217.87 : x
  2. Step 2: Convert to fraction form
    21,271.68/31,903.25 = 20,217.87/x
  3. Step 3: Cross multiply
    21,271.68x = 31,903.25 × 20,217.87
  4. Step 4: Simplify right side
    21,271.68x = 645,015,659.99
  5. Step 5: Solve for x
    x = 645,015,659.99/21,271.68
  6. Step 6: Final answer
    x = 30,322.74

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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.