Home / 20,915.46-28,861.56-11,961.51

Finding the Fourth Proportional to 20,915.46, 28,861.56 and 11,961.51

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Solution

The fourth proportional to 20,915.46, 28,861.56 and 11,961.51 is: 16,505.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.46 : 28,861.56 = 11,961.51 : x
  2. Step 2: Convert to fraction form
    20,915.46/28,861.56 = 11,961.51/x
  3. Step 3: Cross multiply
    20,915.46x = 28,861.56 × 11,961.51
  4. Step 4: Simplify right side
    20,915.46x = 345,227,838.56
  5. Step 5: Solve for x
    x = 345,227,838.56/20,915.46
  6. Step 6: Final answer
    x = 16,505.87

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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.