Home / 20,640.20-28,483.16-11,687.46

Finding the Fourth Proportional to 20,640.20, 28,483.16 and 11,687.46

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Solution

The fourth proportional to 20,640.20, 28,483.16 and 11,687.46 is: 16,128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.20 : 28,483.16 = 11,687.46 : x
  2. Step 2: Convert to fraction form
    20,640.20/28,483.16 = 11,687.46/x
  3. Step 3: Cross multiply
    20,640.20x = 28,483.16 × 11,687.46
  4. Step 4: Simplify right side
    20,640.20x = 332,895,793.17
  5. Step 5: Solve for x
    x = 332,895,793.17/20,640.20
  6. Step 6: Final answer
    x = 16,128.52

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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.