Home / 20,730.20-31,061.10-11,949.80

Finding the Fourth Proportional to 20,730.20, 31,061.10 and 11,949.80

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Solution

The fourth proportional to 20,730.20, 31,061.10 and 11,949.80 is: 17,904.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,730.20 : 31,061.10 = 11,949.80 : x
  2. Step 2: Convert to fraction form
    20,730.20/31,061.10 = 11,949.80/x
  3. Step 3: Cross multiply
    20,730.20x = 31,061.10 × 11,949.80
  4. Step 4: Simplify right side
    20,730.20x = 371,173,932.78
  5. Step 5: Solve for x
    x = 371,173,932.78/20,730.20
  6. Step 6: Final answer
    x = 17,904.99

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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.