Home / 20,922.16-31,378.44-12,491.04

Finding the Fourth Proportional to 20,922.16, 31,378.44 and 12,491.04

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Solution

The fourth proportional to 20,922.16, 31,378.44 and 12,491.04 is: 18,733.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,922.16 : 31,378.44 = 12,491.04 : x
  2. Step 2: Convert to fraction form
    20,922.16/31,378.44 = 12,491.04/x
  3. Step 3: Cross multiply
    20,922.16x = 31,378.44 × 12,491.04
  4. Step 4: Simplify right side
    20,922.16x = 391,949,349.18
  5. Step 5: Solve for x
    x = 391,949,349.18/20,922.16
  6. Step 6: Final answer
    x = 18,733.69

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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.