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Finding the Fourth Proportional to 212,458.82, 318,689.01 and 79,337.66

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Solution

The fourth proportional to 212,458.82, 318,689.01 and 79,337.66 is: 119,006.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,458.82 : 318,689.01 = 79,337.66 : x
  2. Step 2: Convert to fraction form
    212,458.82/318,689.01 = 79,337.66/x
  3. Step 3: Cross multiply
    212,458.82x = 318,689.01 × 79,337.66
  4. Step 4: Simplify right side
    212,458.82x = 25,284,040,321.12
  5. Step 5: Solve for x
    x = 25,284,040,321.12/212,458.82
  6. Step 6: Final answer
    x = 119,006.78

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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.