Home / 20,420.48-30,630.88-11,181.44

Finding the Fourth Proportional to 20,420.48, 30,630.88 and 11,181.44

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Solution

The fourth proportional to 20,420.48, 30,630.88 and 11,181.44 is: 16,772.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.48 : 30,630.88 = 11,181.44 : x
  2. Step 2: Convert to fraction form
    20,420.48/30,630.88 = 11,181.44/x
  3. Step 3: Cross multiply
    20,420.48x = 30,630.88 × 11,181.44
  4. Step 4: Simplify right side
    20,420.48x = 342,497,346.87
  5. Step 5: Solve for x
    x = 342,497,346.87/20,420.48
  6. Step 6: Final answer
    x = 16,772.25

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.