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Finding the Fourth Proportional to 20,610.72, 30,916.80 and 7,460.64

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Solution

The fourth proportional to 20,610.72, 30,916.80 and 7,460.64 is: 11,191.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,610.72 : 30,916.80 = 7,460.64 : x
  2. Step 2: Convert to fraction form
    20,610.72/30,916.80 = 7,460.64/x
  3. Step 3: Cross multiply
    20,610.72x = 30,916.80 × 7,460.64
  4. Step 4: Simplify right side
    20,610.72x = 230,659,114.75
  5. Step 5: Solve for x
    x = 230,659,114.75/20,610.72
  6. Step 6: Final answer
    x = 11,191.22

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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.