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Finding the Fourth Proportional to 20,419.79, 30,634.04 and 7,093.20

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Solution

The fourth proportional to 20,419.79, 30,634.04 and 7,093.20 is: 10,641.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.79 : 30,634.04 = 7,093.20 : x
  2. Step 2: Convert to fraction form
    20,419.79/30,634.04 = 7,093.20/x
  3. Step 3: Cross multiply
    20,419.79x = 30,634.04 × 7,093.20
  4. Step 4: Simplify right side
    20,419.79x = 217,293,275.38
  5. Step 5: Solve for x
    x = 217,293,275.38/20,419.79
  6. Step 6: Final answer
    x = 10,641.31

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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.