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Finding the Fourth Proportional to 15,694.71, 21,659.76 and 8,621.21

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Solution

The fourth proportional to 15,694.71, 21,659.76 and 8,621.21 is: 11,897.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,694.71 : 21,659.76 = 8,621.21 : x
  2. Step 2: Convert to fraction form
    15,694.71/21,659.76 = 8,621.21/x
  3. Step 3: Cross multiply
    15,694.71x = 21,659.76 × 8,621.21
  4. Step 4: Simplify right side
    15,694.71x = 186,733,231.21
  5. Step 5: Solve for x
    x = 186,733,231.21/15,694.71
  6. Step 6: Final answer
    x = 11,897.85

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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.