Home / 20,958.48-28,914.12-13,402.80

Finding the Fourth Proportional to 20,958.48, 28,914.12 and 13,402.80

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Solution

The fourth proportional to 20,958.48, 28,914.12 and 13,402.80 is: 18,490.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,958.48 : 28,914.12 = 13,402.80 : x
  2. Step 2: Convert to fraction form
    20,958.48/28,914.12 = 13,402.80/x
  3. Step 3: Cross multiply
    20,958.48x = 28,914.12 × 13,402.80
  4. Step 4: Simplify right side
    20,958.48x = 387,530,167.54
  5. Step 5: Solve for x
    x = 387,530,167.54/20,958.48
  6. Step 6: Final answer
    x = 18,490.38

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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.