Home / 20,915.15-28,863.81-11,965.46

Finding the Fourth Proportional to 20,915.15, 28,863.81 and 11,965.46

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Solution

The fourth proportional to 20,915.15, 28,863.81 and 11,965.46 is: 16,512.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.15 : 28,863.81 = 11,965.46 : x
  2. Step 2: Convert to fraction form
    20,915.15/28,863.81 = 11,965.46/x
  3. Step 3: Cross multiply
    20,915.15x = 28,863.81 × 11,965.46
  4. Step 4: Simplify right side
    20,915.15x = 345,368,619.68
  5. Step 5: Solve for x
    x = 345,368,619.68/20,915.15
  6. Step 6: Final answer
    x = 16,512.85

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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.