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Finding the Fourth Proportional to 15,809.81, 21,819.87 and 9,843.35

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Solution

The fourth proportional to 15,809.81, 21,819.87 and 9,843.35 is: 13,585.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,809.81 : 21,819.87 = 9,843.35 : x
  2. Step 2: Convert to fraction form
    15,809.81/21,819.87 = 9,843.35/x
  3. Step 3: Cross multiply
    15,809.81x = 21,819.87 × 9,843.35
  4. Step 4: Simplify right side
    15,809.81x = 214,780,568.15
  5. Step 5: Solve for x
    x = 214,780,568.15/15,809.81
  6. Step 6: Final answer
    x = 13,585.27

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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.