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Finding the Fourth Proportional to 20,110.80, 30,160.80 and 8,421.60

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Solution

The fourth proportional to 20,110.80, 30,160.80 and 8,421.60 is: 12,630.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,110.80 : 30,160.80 = 8,421.60 : x
  2. Step 2: Convert to fraction form
    20,110.80/30,160.80 = 8,421.60/x
  3. Step 3: Cross multiply
    20,110.80x = 30,160.80 × 8,421.60
  4. Step 4: Simplify right side
    20,110.80x = 254,002,193.28
  5. Step 5: Solve for x
    x = 254,002,193.28/20,110.80
  6. Step 6: Final answer
    x = 12,630.14

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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.