Home / 20,621.88-28,458.18-11,190.42

Finding the Fourth Proportional to 20,621.88, 28,458.18 and 11,190.42

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Solution

The fourth proportional to 20,621.88, 28,458.18 and 11,190.42 is: 15,442.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.88 : 28,458.18 = 11,190.42 : x
  2. Step 2: Convert to fraction form
    20,621.88/28,458.18 = 11,190.42/x
  3. Step 3: Cross multiply
    20,621.88x = 28,458.18 × 11,190.42
  4. Step 4: Simplify right side
    20,621.88x = 318,458,986.64
  5. Step 5: Solve for x
    x = 318,458,986.64/20,621.88
  6. Step 6: Final answer
    x = 15,442.77

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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.