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Finding the Fourth Proportional to 15,909.68, 21,956.54 and 9,861.11

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Solution

The fourth proportional to 15,909.68, 21,956.54 and 9,861.11 is: 13,609.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,909.68 : 21,956.54 = 9,861.11 : x
  2. Step 2: Convert to fraction form
    15,909.68/21,956.54 = 9,861.11/x
  3. Step 3: Cross multiply
    15,909.68x = 21,956.54 × 9,861.11
  4. Step 4: Simplify right side
    15,909.68x = 216,515,856.16
  5. Step 5: Solve for x
    x = 216,515,856.16/15,909.68
  6. Step 6: Final answer
    x = 13,609.06

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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.