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Finding the Fourth Proportional to 18,909.42, 28,354.41 and 8,515.50

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Solution

The fourth proportional to 18,909.42, 28,354.41 and 8,515.50 is: 12,768.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.42 : 28,354.41 = 8,515.50 : x
  2. Step 2: Convert to fraction form
    18,909.42/28,354.41 = 8,515.50/x
  3. Step 3: Cross multiply
    18,909.42x = 28,354.41 × 8,515.50
  4. Step 4: Simplify right side
    18,909.42x = 241,451,978.36
  5. Step 5: Solve for x
    x = 241,451,978.36/18,909.42
  6. Step 6: Final answer
    x = 12,768.87

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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.