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Finding the Fourth Proportional to 18,908.91, 28,380.88 and 9,555.54

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Solution

The fourth proportional to 18,908.91, 28,380.88 and 9,555.54 is: 14,342.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,908.91 : 28,380.88 = 9,555.54 : x
  2. Step 2: Convert to fraction form
    18,908.91/28,380.88 = 9,555.54/x
  3. Step 3: Cross multiply
    18,908.91x = 28,380.88 × 9,555.54
  4. Step 4: Simplify right side
    18,908.91x = 271,194,539.59
  5. Step 5: Solve for x
    x = 271,194,539.59/18,908.91
  6. Step 6: Final answer
    x = 14,342.16

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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.