Home / 20,890.71-31,320.48-12,568.78

Finding the Fourth Proportional to 20,890.71, 31,320.48 and 12,568.78

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Solution

The fourth proportional to 20,890.71, 31,320.48 and 12,568.78 is: 18,843.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.71 : 31,320.48 = 12,568.78 : x
  2. Step 2: Convert to fraction form
    20,890.71/31,320.48 = 12,568.78/x
  3. Step 3: Cross multiply
    20,890.71x = 31,320.48 × 12,568.78
  4. Step 4: Simplify right side
    20,890.71x = 393,660,034.59
  5. Step 5: Solve for x
    x = 393,660,034.59/20,890.71
  6. Step 6: Final answer
    x = 18,843.78

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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.