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Finding the Fourth Proportional to 15,809.81, 21,817.82 and 8,639.69

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Solution

The fourth proportional to 15,809.81, 21,817.82 and 8,639.69 is: 11,922.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,809.81 : 21,817.82 = 8,639.69 : x
  2. Step 2: Convert to fraction form
    15,809.81/21,817.82 = 8,639.69/x
  3. Step 3: Cross multiply
    15,809.81x = 21,817.82 × 8,639.69
  4. Step 4: Simplify right side
    15,809.81x = 188,499,048.99
  5. Step 5: Solve for x
    x = 188,499,048.99/15,809.81
  6. Step 6: Final answer
    x = 11,922.92

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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.