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Finding the Fourth Proportional to 18,420.62, 27,624.09 and 12,529.54

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Solution

The fourth proportional to 18,420.62, 27,624.09 and 12,529.54 is: 18,789.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.62 : 27,624.09 = 12,529.54 : x
  2. Step 2: Convert to fraction form
    18,420.62/27,624.09 = 12,529.54/x
  3. Step 3: Cross multiply
    18,420.62x = 27,624.09 × 12,529.54
  4. Step 4: Simplify right side
    18,420.62x = 346,116,996.27
  5. Step 5: Solve for x
    x = 346,116,996.27/18,420.62
  6. Step 6: Final answer
    x = 18,789.65

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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.