Home / 20,812.93-28,720.39-13,147.27

Finding the Fourth Proportional to 20,812.93, 28,720.39 and 13,147.27

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Solution

The fourth proportional to 20,812.93, 28,720.39 and 13,147.27 is: 18,142.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.93 : 28,720.39 = 13,147.27 : x
  2. Step 2: Convert to fraction form
    20,812.93/28,720.39 = 13,147.27/x
  3. Step 3: Cross multiply
    20,812.93x = 28,720.39 × 13,147.27
  4. Step 4: Simplify right side
    20,812.93x = 377,594,721.84
  5. Step 5: Solve for x
    x = 377,594,721.84/20,812.93
  6. Step 6: Final answer
    x = 18,142.31

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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.