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Finding the Fourth Proportional to 18,781.08, 28,157.04 and 8,905.56

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Solution

The fourth proportional to 18,781.08, 28,157.04 and 8,905.56 is: 13,351.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.08 : 28,157.04 = 8,905.56 : x
  2. Step 2: Convert to fraction form
    18,781.08/28,157.04 = 8,905.56/x
  3. Step 3: Cross multiply
    18,781.08x = 28,157.04 × 8,905.56
  4. Step 4: Simplify right side
    18,781.08x = 250,754,209.14
  5. Step 5: Solve for x
    x = 250,754,209.14/18,781.08
  6. Step 6: Final answer
    x = 13,351.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.