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Finding the Fourth Proportional to 212,107.86, 318,161.79 and 87,445.62

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Solution

The fourth proportional to 212,107.86, 318,161.79 and 87,445.62 is: 131,168.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,107.86 : 318,161.79 = 87,445.62 : x
  2. Step 2: Convert to fraction form
    212,107.86/318,161.79 = 87,445.62/x
  3. Step 3: Cross multiply
    212,107.86x = 318,161.79 × 87,445.62
  4. Step 4: Simplify right side
    212,107.86x = 27,821,854,986.86
  5. Step 5: Solve for x
    x = 27,821,854,986.86/212,107.86
  6. Step 6: Final answer
    x = 131,168.43

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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.