Home / 20,392.80-28,142.15-11,318.34

Finding the Fourth Proportional to 20,392.80, 28,142.15 and 11,318.34

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Solution

The fourth proportional to 20,392.80, 28,142.15 and 11,318.34 is: 15,619.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,392.80 : 28,142.15 = 11,318.34 : x
  2. Step 2: Convert to fraction form
    20,392.80/28,142.15 = 11,318.34/x
  3. Step 3: Cross multiply
    20,392.80x = 28,142.15 × 11,318.34
  4. Step 4: Simplify right side
    20,392.80x = 318,522,365.44
  5. Step 5: Solve for x
    x = 318,522,365.44/20,392.80
  6. Step 6: Final answer
    x = 15,619.35

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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.