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Finding the Fourth Proportional to 212,722.28, 319,138.77 and 79,613

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Solution

The fourth proportional to 212,722.28, 319,138.77 and 79,613 is: 119,440.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,722.28 : 319,138.77 = 79,613 : x
  2. Step 2: Convert to fraction form
    212,722.28/319,138.77 = 79,613/x
  3. Step 3: Cross multiply
    212,722.28x = 319,138.77 × 79,613
  4. Step 4: Simplify right side
    212,722.28x = 25,407,594,896.01
  5. Step 5: Solve for x
    x = 25,407,594,896.01/212,722.28
  6. Step 6: Final answer
    x = 119,440.22

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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.