Home / 20,918.87-28,860.91-13,369.55

Finding the Fourth Proportional to 20,918.87, 28,860.91 and 13,369.55

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Solution

The fourth proportional to 20,918.87, 28,860.91 and 13,369.55 is: 18,445.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.87 : 28,860.91 = 13,369.55 : x
  2. Step 2: Convert to fraction form
    20,918.87/28,860.91 = 13,369.55/x
  3. Step 3: Cross multiply
    20,918.87x = 28,860.91 × 13,369.55
  4. Step 4: Simplify right side
    20,918.87x = 385,857,451.44
  5. Step 5: Solve for x
    x = 385,857,451.44/20,918.87
  6. Step 6: Final answer
    x = 18,445.43

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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.