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Finding the Fourth Proportional to 18,421.70, 27,609.42 and 7,879.32

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Solution

The fourth proportional to 18,421.70, 27,609.42 and 7,879.32 is: 11,809.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.70 : 27,609.42 = 7,879.32 : x
  2. Step 2: Convert to fraction form
    18,421.70/27,609.42 = 7,879.32/x
  3. Step 3: Cross multiply
    18,421.70x = 27,609.42 × 7,879.32
  4. Step 4: Simplify right side
    18,421.70x = 217,543,455.19
  5. Step 5: Solve for x
    x = 217,543,455.19/18,421.70
  6. Step 6: Final answer
    x = 11,809.09

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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.