Home / 20,807.92-28,720.27-12,845.59

Finding the Fourth Proportional to 20,807.92, 28,720.27 and 12,845.59

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Solution

The fourth proportional to 20,807.92, 28,720.27 and 12,845.59 is: 17,730.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.92 : 28,720.27 = 12,845.59 : x
  2. Step 2: Convert to fraction form
    20,807.92/28,720.27 = 12,845.59/x
  3. Step 3: Cross multiply
    20,807.92x = 28,720.27 × 12,845.59
  4. Step 4: Simplify right side
    20,807.92x = 368,928,757.37
  5. Step 5: Solve for x
    x = 368,928,757.37/20,807.92
  6. Step 6: Final answer
    x = 17,730.21

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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.