Home / 20,960.91-28,917.68-13,405.50

Finding the Fourth Proportional to 20,960.91, 28,917.68 and 13,405.50

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Solution

The fourth proportional to 20,960.91, 28,917.68 and 13,405.50 is: 18,494.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.91 : 28,917.68 = 13,405.50 : x
  2. Step 2: Convert to fraction form
    20,960.91/28,917.68 = 13,405.50/x
  3. Step 3: Cross multiply
    20,960.91x = 28,917.68 × 13,405.50
  4. Step 4: Simplify right side
    20,960.91x = 387,655,892.21
  5. Step 5: Solve for x
    x = 387,655,892.21/20,960.91
  6. Step 6: Final answer
    x = 18,494.23

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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.