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Finding the Fourth Proportional to 15,882.71, 21,917.14 and 8,809.58

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Solution

The fourth proportional to 15,882.71, 21,917.14 and 8,809.58 is: 12,156.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,882.71 : 21,917.14 = 8,809.58 : x
  2. Step 2: Convert to fraction form
    15,882.71/21,917.14 = 8,809.58/x
  3. Step 3: Cross multiply
    15,882.71x = 21,917.14 × 8,809.58
  4. Step 4: Simplify right side
    15,882.71x = 193,080,830.97
  5. Step 5: Solve for x
    x = 193,080,830.97/15,882.71
  6. Step 6: Final answer
    x = 12,156.67

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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.