Home / 20,489.10-28,275.20-11,989.37

Finding the Fourth Proportional to 20,489.10, 28,275.20 and 11,989.37

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Solution

The fourth proportional to 20,489.10, 28,275.20 and 11,989.37 is: 16,545.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.10 : 28,275.20 = 11,989.37 : x
  2. Step 2: Convert to fraction form
    20,489.10/28,275.20 = 11,989.37/x
  3. Step 3: Cross multiply
    20,489.10x = 28,275.20 × 11,989.37
  4. Step 4: Simplify right side
    20,489.10x = 339,001,633.30
  5. Step 5: Solve for x
    x = 339,001,633.30/20,489.10
  6. Step 6: Final answer
    x = 16,545.46

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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.