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Finding the Fourth Proportional to 15,685, 21,644.22 and 8,609.96

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Solution

The fourth proportional to 15,685, 21,644.22 and 8,609.96 is: 11,881.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685 : 21,644.22 = 8,609.96 : x
  2. Step 2: Convert to fraction form
    15,685/21,644.22 = 8,609.96/x
  3. Step 3: Cross multiply
    15,685x = 21,644.22 × 8,609.96
  4. Step 4: Simplify right side
    15,685x = 186,355,868.43
  5. Step 5: Solve for x
    x = 186,355,868.43/15,685
  6. Step 6: Final answer
    x = 11,881.15

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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.