Home / 20,405.28-28,159.34-11,452.80

Finding the Fourth Proportional to 20,405.28, 28,159.34 and 11,452.80

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Solution

The fourth proportional to 20,405.28, 28,159.34 and 11,452.80 is: 15,804.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.28 : 28,159.34 = 11,452.80 : x
  2. Step 2: Convert to fraction form
    20,405.28/28,159.34 = 11,452.80/x
  3. Step 3: Cross multiply
    20,405.28x = 28,159.34 × 11,452.80
  4. Step 4: Simplify right side
    20,405.28x = 322,503,231.89
  5. Step 5: Solve for x
    x = 322,503,231.89/20,405.28
  6. Step 6: Final answer
    x = 15,804.89

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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.