Home / 20,643.80-28,490.33-11,691.68

Finding the Fourth Proportional to 20,643.80, 28,490.33 and 11,691.68

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Solution

The fourth proportional to 20,643.80, 28,490.33 and 11,691.68 is: 16,135.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.80 : 28,490.33 = 11,691.68 : x
  2. Step 2: Convert to fraction form
    20,643.80/28,490.33 = 11,691.68/x
  3. Step 3: Cross multiply
    20,643.80x = 28,490.33 × 11,691.68
  4. Step 4: Simplify right side
    20,643.80x = 333,099,708.23
  5. Step 5: Solve for x
    x = 333,099,708.23/20,643.80
  6. Step 6: Final answer
    x = 16,135.58

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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.