Home / 20,920.96-28,857.36-13,369.60

Finding the Fourth Proportional to 20,920.96, 28,857.36 and 13,369.60

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Solution

The fourth proportional to 20,920.96, 28,857.36 and 13,369.60 is: 18,441.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.96 : 28,857.36 = 13,369.60 : x
  2. Step 2: Convert to fraction form
    20,920.96/28,857.36 = 13,369.60/x
  3. Step 3: Cross multiply
    20,920.96x = 28,857.36 × 13,369.60
  4. Step 4: Simplify right side
    20,920.96x = 385,811,360.26
  5. Step 5: Solve for x
    x = 385,811,360.26/20,920.96
  6. Step 6: Final answer
    x = 18,441.38

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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.