Home / 20,720.78-28,593.91-12,667.92

Finding the Fourth Proportional to 20,720.78, 28,593.91 and 12,667.92

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Solution

The fourth proportional to 20,720.78, 28,593.91 and 12,667.92 is: 17,481.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.78 : 28,593.91 = 12,667.92 : x
  2. Step 2: Convert to fraction form
    20,720.78/28,593.91 = 12,667.92/x
  3. Step 3: Cross multiply
    20,720.78x = 28,593.91 × 12,667.92
  4. Step 4: Simplify right side
    20,720.78x = 362,225,487.43
  5. Step 5: Solve for x
    x = 362,225,487.43/20,720.78
  6. Step 6: Final answer
    x = 17,481.26

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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.