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Finding the Fourth Proportional to 15,891.05, 21,928.88 and 8,720.80

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Solution

The fourth proportional to 15,891.05, 21,928.88 and 8,720.80 is: 12,034.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.05 : 21,928.88 = 8,720.80 : x
  2. Step 2: Convert to fraction form
    15,891.05/21,928.88 = 8,720.80/x
  3. Step 3: Cross multiply
    15,891.05x = 21,928.88 × 8,720.80
  4. Step 4: Simplify right side
    15,891.05x = 191,237,343.68
  5. Step 5: Solve for x
    x = 191,237,343.68/15,891.05
  6. Step 6: Final answer
    x = 12,034.28

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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.