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Finding the Fourth Proportional to 15,789.68, 21,790.08 and 8,716.08

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Solution

The fourth proportional to 15,789.68, 21,790.08 and 8,716.08 is: 12,028.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.68 : 21,790.08 = 8,716.08 : x
  2. Step 2: Convert to fraction form
    15,789.68/21,790.08 = 8,716.08/x
  3. Step 3: Cross multiply
    15,789.68x = 21,790.08 × 8,716.08
  4. Step 4: Simplify right side
    15,789.68x = 189,924,080.49
  5. Step 5: Solve for x
    x = 189,924,080.49/15,789.68
  6. Step 6: Final answer
    x = 12,028.37

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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.