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Finding the Fourth Proportional to 18,934.60, 28,399.96 and 8,404.80

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Solution

The fourth proportional to 18,934.60, 28,399.96 and 8,404.80 is: 12,606.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,934.60 : 28,399.96 = 8,404.80 : x
  2. Step 2: Convert to fraction form
    18,934.60/28,399.96 = 8,404.80/x
  3. Step 3: Cross multiply
    18,934.60x = 28,399.96 × 8,404.80
  4. Step 4: Simplify right side
    18,934.60x = 238,695,983.81
  5. Step 5: Solve for x
    x = 238,695,983.81/18,934.60
  6. Step 6: Final answer
    x = 12,606.34

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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.