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Finding the Fourth Proportional to 212,474.85, 318,680.69 and 79,338.39

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Solution

The fourth proportional to 212,474.85, 318,680.69 and 79,338.39 is: 118,995.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,474.85 : 318,680.69 = 79,338.39 : x
  2. Step 2: Convert to fraction form
    212,474.85/318,680.69 = 79,338.39/x
  3. Step 3: Cross multiply
    212,474.85x = 318,680.69 × 79,338.39
  4. Step 4: Simplify right side
    212,474.85x = 25,283,612,472.00
  5. Step 5: Solve for x
    x = 25,283,612,472.00/212,474.85
  6. Step 6: Final answer
    x = 118,995.79

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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.