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Finding the Fourth Proportional to 20,278.71, 30,419.66 and 7,134.03

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Solution

The fourth proportional to 20,278.71, 30,419.66 and 7,134.03 is: 10,701.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,278.71 : 30,419.66 = 7,134.03 : x
  2. Step 2: Convert to fraction form
    20,278.71/30,419.66 = 7,134.03/x
  3. Step 3: Cross multiply
    20,278.71x = 30,419.66 × 7,134.03
  4. Step 4: Simplify right side
    20,278.71x = 217,014,784.86
  5. Step 5: Solve for x
    x = 217,014,784.86/20,278.71
  6. Step 6: Final answer
    x = 10,701.61

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.