Home / 212,721.28-319,137.27-79,612

Finding the Fourth Proportional to 212,721.28, 319,137.27 and 79,612

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Solution

The fourth proportional to 212,721.28, 319,137.27 and 79,612 is: 119,438.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,721.28 : 319,137.27 = 79,612 : x
  2. Step 2: Convert to fraction form
    212,721.28/319,137.27 = 79,612/x
  3. Step 3: Cross multiply
    212,721.28x = 319,137.27 × 79,612
  4. Step 4: Simplify right side
    212,721.28x = 25,407,156,339.24
  5. Step 5: Solve for x
    x = 25,407,156,339.24/212,721.28
  6. Step 6: Final answer
    x = 119,438.72

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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.