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Finding the Fourth Proportional to 15,139.75, 20,892.86 and 8,515.75

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Solution

The fourth proportional to 15,139.75, 20,892.86 and 8,515.75 is: 11,751.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,139.75 : 20,892.86 = 8,515.75 : x
  2. Step 2: Convert to fraction form
    15,139.75/20,892.86 = 8,515.75/x
  3. Step 3: Cross multiply
    15,139.75x = 20,892.86 × 8,515.75
  4. Step 4: Simplify right side
    15,139.75x = 177,918,329.97
  5. Step 5: Solve for x
    x = 177,918,329.97/15,139.75
  6. Step 6: Final answer
    x = 11,751.74

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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.