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Finding the Fourth Proportional to 20,407.60, 30,609.60 and 5,615.20

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Solution

The fourth proportional to 20,407.60, 30,609.60 and 5,615.20 is: 8,422.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,407.60 : 30,609.60 = 5,615.20 : x
  2. Step 2: Convert to fraction form
    20,407.60/30,609.60 = 5,615.20/x
  3. Step 3: Cross multiply
    20,407.60x = 30,609.60 × 5,615.20
  4. Step 4: Simplify right side
    20,407.60x = 171,879,025.92
  5. Step 5: Solve for x
    x = 171,879,025.92/20,407.60
  6. Step 6: Final answer
    x = 8,422.30

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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.