Home / 20,640.77-28,489.37-11,693.55

Finding the Fourth Proportional to 20,640.77, 28,489.37 and 11,693.55

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Solution

The fourth proportional to 20,640.77, 28,489.37 and 11,693.55 is: 16,139.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.77 : 28,489.37 = 11,693.55 : x
  2. Step 2: Convert to fraction form
    20,640.77/28,489.37 = 11,693.55/x
  3. Step 3: Cross multiply
    20,640.77x = 28,489.37 × 11,693.55
  4. Step 4: Simplify right side
    20,640.77x = 333,141,814.10
  5. Step 5: Solve for x
    x = 333,141,814.10/20,640.77
  6. Step 6: Final answer
    x = 16,139.99

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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.