Home / 20,129.20-30,195.36-7,655.20

Finding the Fourth Proportional to 20,129.20, 30,195.36 and 7,655.20

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Solution

The fourth proportional to 20,129.20, 30,195.36 and 7,655.20 is: 11,483.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.20 : 30,195.36 = 7,655.20 : x
  2. Step 2: Convert to fraction form
    20,129.20/30,195.36 = 7,655.20/x
  3. Step 3: Cross multiply
    20,129.20x = 30,195.36 × 7,655.20
  4. Step 4: Simplify right side
    20,129.20x = 231,151,519.87
  5. Step 5: Solve for x
    x = 231,151,519.87/20,129.20
  6. Step 6: Final answer
    x = 11,483.39

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Half scale
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Double scale
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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.