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Finding the Fourth Proportional to 212,590.08, 318,939.89 and 79,471.31

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Solution

The fourth proportional to 212,590.08, 318,939.89 and 79,471.31 is: 119,227.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,590.08 : 318,939.89 = 79,471.31 : x
  2. Step 2: Convert to fraction form
    212,590.08/318,939.89 = 79,471.31/x
  3. Step 3: Cross multiply
    212,590.08x = 318,939.89 × 79,471.31
  4. Step 4: Simplify right side
    212,590.08x = 25,346,568,877.50
  5. Step 5: Solve for x
    x = 25,346,568,877.50/212,590.08
  6. Step 6: Final answer
    x = 119,227.43

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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.