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Finding the Fourth Proportional to 212,285.97, 318,418.54 and 79,155.81

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Solution

The fourth proportional to 212,285.97, 318,418.54 and 79,155.81 is: 118,729.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,285.97 : 318,418.54 = 79,155.81 : x
  2. Step 2: Convert to fraction form
    212,285.97/318,418.54 = 79,155.81/x
  3. Step 3: Cross multiply
    212,285.97x = 318,418.54 × 79,155.81
  4. Step 4: Simplify right side
    212,285.97x = 25,204,677,452.72
  5. Step 5: Solve for x
    x = 25,204,677,452.72/212,285.97
  6. Step 6: Final answer
    x = 118,729.83

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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.