Home / 20,862.05-28,789.16-11,909.34

Finding the Fourth Proportional to 20,862.05, 28,789.16 and 11,909.34

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Solution

The fourth proportional to 20,862.05, 28,789.16 and 11,909.34 is: 16,434.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.05 : 28,789.16 = 11,909.34 : x
  2. Step 2: Convert to fraction form
    20,862.05/28,789.16 = 11,909.34/x
  3. Step 3: Cross multiply
    20,862.05x = 28,789.16 × 11,909.34
  4. Step 4: Simplify right side
    20,862.05x = 342,859,835.21
  5. Step 5: Solve for x
    x = 342,859,835.21/20,862.05
  6. Step 6: Final answer
    x = 16,434.62

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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.