Home / 20,139.72-30,202.36-7,656.42

Finding the Fourth Proportional to 20,139.72, 30,202.36 and 7,656.42

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Solution

The fourth proportional to 20,139.72, 30,202.36 and 7,656.42 is: 11,481.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.72 : 30,202.36 = 7,656.42 : x
  2. Step 2: Convert to fraction form
    20,139.72/30,202.36 = 7,656.42/x
  3. Step 3: Cross multiply
    20,139.72x = 30,202.36 × 7,656.42
  4. Step 4: Simplify right side
    20,139.72x = 231,241,953.15
  5. Step 5: Solve for x
    x = 231,241,953.15/20,139.72
  6. Step 6: Final answer
    x = 11,481.89

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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.