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Finding the Fourth Proportional to 20,419.61, 30,624.56 and 7,939.13

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Solution

The fourth proportional to 20,419.61, 30,624.56 and 7,939.13 is: 11,906.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.61 : 30,624.56 = 7,939.13 : x
  2. Step 2: Convert to fraction form
    20,419.61/30,624.56 = 7,939.13/x
  3. Step 3: Cross multiply
    20,419.61x = 30,624.56 × 7,939.13
  4. Step 4: Simplify right side
    20,419.61x = 243,132,399.90
  5. Step 5: Solve for x
    x = 243,132,399.90/20,419.61
  6. Step 6: Final answer
    x = 11,906.81

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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.