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Finding the Fourth Proportional to 15,606.20, 21,540.78 and 9,321.40

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Solution

The fourth proportional to 15,606.20, 21,540.78 and 9,321.40 is: 12,866.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,606.20 : 21,540.78 = 9,321.40 : x
  2. Step 2: Convert to fraction form
    15,606.20/21,540.78 = 9,321.40/x
  3. Step 3: Cross multiply
    15,606.20x = 21,540.78 × 9,321.40
  4. Step 4: Simplify right side
    15,606.20x = 200,790,226.69
  5. Step 5: Solve for x
    x = 200,790,226.69/15,606.20
  6. Step 6: Final answer
    x = 12,866.05

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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.