Home / 20,961.99-31,403.37-12,387.86

Finding the Fourth Proportional to 20,961.99, 31,403.37 and 12,387.86

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Solution

The fourth proportional to 20,961.99, 31,403.37 and 12,387.86 is: 18,558.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.99 : 31,403.37 = 12,387.86 : x
  2. Step 2: Convert to fraction form
    20,961.99/31,403.37 = 12,387.86/x
  3. Step 3: Cross multiply
    20,961.99x = 31,403.37 × 12,387.86
  4. Step 4: Simplify right side
    20,961.99x = 389,020,551.09
  5. Step 5: Solve for x
    x = 389,020,551.09/20,961.99
  6. Step 6: Final answer
    x = 18,558.38

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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.