Home / 20,689.50-28,556.37-12,310.86

Finding the Fourth Proportional to 20,689.50, 28,556.37 and 12,310.86

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Solution

The fourth proportional to 20,689.50, 28,556.37 and 12,310.86 is: 16,991.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.50 : 28,556.37 = 12,310.86 : x
  2. Step 2: Convert to fraction form
    20,689.50/28,556.37 = 12,310.86/x
  3. Step 3: Cross multiply
    20,689.50x = 28,556.37 × 12,310.86
  4. Step 4: Simplify right side
    20,689.50x = 351,553,473.18
  5. Step 5: Solve for x
    x = 351,553,473.18/20,689.50
  6. Step 6: Final answer
    x = 16,991.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.