Home / 21,439.68-31,865.52-20,857.92

Finding the Fourth Proportional to 21,439.68, 31,865.52 and 20,857.92

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Solution

The fourth proportional to 21,439.68, 31,865.52 and 20,857.92 is: 31,000.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,439.68 : 31,865.52 = 20,857.92 : x
  2. Step 2: Convert to fraction form
    21,439.68/31,865.52 = 20,857.92/x
  3. Step 3: Cross multiply
    21,439.68x = 31,865.52 × 20,857.92
  4. Step 4: Simplify right side
    21,439.68x = 664,648,466.92
  5. Step 5: Solve for x
    x = 664,648,466.92/21,439.68
  6. Step 6: Final answer
    x = 31,000.86

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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.