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Finding the Fourth Proportional to 212,958.48, 319,491.76 and 79,839.12

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Solution

The fourth proportional to 212,958.48, 319,491.76 and 79,839.12 is: 119,778.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,958.48 : 319,491.76 = 79,839.12 : x
  2. Step 2: Convert to fraction form
    212,958.48/319,491.76 = 79,839.12/x
  3. Step 3: Cross multiply
    212,958.48x = 319,491.76 × 79,839.12
  4. Step 4: Simplify right side
    212,958.48x = 25,507,940,965.65
  5. Step 5: Solve for x
    x = 25,507,940,965.65/212,958.48
  6. Step 6: Final answer
    x = 119,778.94

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1.5x scale

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.