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Finding the Fourth Proportional to 20,640.93, 28,489.01 and 13,568.01

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Solution

The fourth proportional to 20,640.93, 28,489.01 and 13,568.01 is: 18,726.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.93 : 28,489.01 = 13,568.01 : x
  2. Step 2: Convert to fraction form
    20,640.93/28,489.01 = 13,568.01/x
  3. Step 3: Cross multiply
    20,640.93x = 28,489.01 × 13,568.01
  4. Step 4: Simplify right side
    20,640.93x = 386,539,172.57
  5. Step 5: Solve for x
    x = 386,539,172.57/20,640.93
  6. Step 6: Final answer
    x = 18,726.83

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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.