Home / 20,217.60-30,319.20-9,129.60

Finding the Fourth Proportional to 20,217.60, 30,319.20 and 9,129.60

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Solution

The fourth proportional to 20,217.60, 30,319.20 and 9,129.60 is: 13,691.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,217.60 : 30,319.20 = 9,129.60 : x
  2. Step 2: Convert to fraction form
    20,217.60/30,319.20 = 9,129.60/x
  3. Step 3: Cross multiply
    20,217.60x = 30,319.20 × 9,129.60
  4. Step 4: Simplify right side
    20,217.60x = 276,802,168.32
  5. Step 5: Solve for x
    x = 276,802,168.32/20,217.60
  6. Step 6: Final answer
    x = 13,691.15

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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.