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Finding the Fourth Proportional to 15,891, 21,929.56 and 8,720.96

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Solution

The fourth proportional to 15,891, 21,929.56 and 8,720.96 is: 12,034.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891 : 21,929.56 = 8,720.96 : x
  2. Step 2: Convert to fraction form
    15,891/21,929.56 = 8,720.96/x
  3. Step 3: Cross multiply
    15,891x = 21,929.56 × 8,720.96
  4. Step 4: Simplify right side
    15,891x = 191,246,815.58
  5. Step 5: Solve for x
    x = 191,246,815.58/15,891
  6. Step 6: Final answer
    x = 12,034.91

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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.