Home / 20,669.20-31,007.12-12,358.64

Finding the Fourth Proportional to 20,669.20, 31,007.12 and 12,358.64

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Solution

The fourth proportional to 20,669.20, 31,007.12 and 12,358.64 is: 18,539.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,669.20 : 31,007.12 = 12,358.64 : x
  2. Step 2: Convert to fraction form
    20,669.20/31,007.12 = 12,358.64/x
  3. Step 3: Cross multiply
    20,669.20x = 31,007.12 × 12,358.64
  4. Step 4: Simplify right side
    20,669.20x = 383,205,833.52
  5. Step 5: Solve for x
    x = 383,205,833.52/20,669.20
  6. Step 6: Final answer
    x = 18,539.95

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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.