Home / 20,915.71-28,865.68-11,961.46

Finding the Fourth Proportional to 20,915.71, 28,865.68 and 11,961.46

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Solution

The fourth proportional to 20,915.71, 28,865.68 and 11,961.46 is: 16,507.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.71 : 28,865.68 = 11,961.46 : x
  2. Step 2: Convert to fraction form
    20,915.71/28,865.68 = 11,961.46/x
  3. Step 3: Cross multiply
    20,915.71x = 28,865.68 × 11,961.46
  4. Step 4: Simplify right side
    20,915.71x = 345,275,676.69
  5. Step 5: Solve for x
    x = 345,275,676.69/20,915.71
  6. Step 6: Final answer
    x = 16,507.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.