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Finding the Fourth Proportional to 15,909.12, 21,954.78 and 8,836.20

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Solution

The fourth proportional to 15,909.12, 21,954.78 and 8,836.20 is: 12,194.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,909.12 : 21,954.78 = 8,836.20 : x
  2. Step 2: Convert to fraction form
    15,909.12/21,954.78 = 8,836.20/x
  3. Step 3: Cross multiply
    15,909.12x = 21,954.78 × 8,836.20
  4. Step 4: Simplify right side
    15,909.12x = 193,996,827.04
  5. Step 5: Solve for x
    x = 193,996,827.04/15,909.12
  6. Step 6: Final answer
    x = 12,194.06

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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.