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Finding the Fourth Proportional to 61,172.80, 91,737.60 and 21,731.20

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Solution

The fourth proportional to 61,172.80, 91,737.60 and 21,731.20 is: 32,589.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,172.80 : 91,737.60 = 21,731.20 : x
  2. Step 2: Convert to fraction form
    61,172.80/91,737.60 = 21,731.20/x
  3. Step 3: Cross multiply
    61,172.80x = 91,737.60 × 21,731.20
  4. Step 4: Simplify right side
    61,172.80x = 1,993,568,133.12
  5. Step 5: Solve for x
    x = 1,993,568,133.12/61,172.80
  6. Step 6: Final answer
    x = 32,589.13

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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.