Home / 20,320.12-30,489.24-12,922.60

Finding the Fourth Proportional to 20,320.12, 30,489.24 and 12,922.60

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Solution

The fourth proportional to 20,320.12, 30,489.24 and 12,922.60 is: 19,389.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,320.12 : 30,489.24 = 12,922.60 : x
  2. Step 2: Convert to fraction form
    20,320.12/30,489.24 = 12,922.60/x
  3. Step 3: Cross multiply
    20,320.12x = 30,489.24 × 12,922.60
  4. Step 4: Simplify right side
    20,320.12x = 394,000,252.82
  5. Step 5: Solve for x
    x = 394,000,252.82/20,320.12
  6. Step 6: Final answer
    x = 19,389.66

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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.