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Finding the Fourth Proportional to 20,409.60, 30,612.60 and 5,617.20

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Solution

The fourth proportional to 20,409.60, 30,612.60 and 5,617.20 is: 8,425.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,409.60 : 30,612.60 = 5,617.20 : x
  2. Step 2: Convert to fraction form
    20,409.60/30,612.60 = 5,617.20/x
  3. Step 3: Cross multiply
    20,409.60x = 30,612.60 × 5,617.20
  4. Step 4: Simplify right side
    20,409.60x = 171,957,096.72
  5. Step 5: Solve for x
    x = 171,957,096.72/20,409.60
  6. Step 6: Final answer
    x = 8,425.30

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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.