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Finding the Fourth Proportional to 6,990.80, 10,490.54 and 2,611.32

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Solution

The fourth proportional to 6,990.80, 10,490.54 and 2,611.32 is: 3,918.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,990.80 : 10,490.54 = 2,611.32 : x
  2. Step 2: Convert to fraction form
    6,990.80/10,490.54 = 2,611.32/x
  3. Step 3: Cross multiply
    6,990.80x = 10,490.54 × 2,611.32
  4. Step 4: Simplify right side
    6,990.80x = 27,394,143.86
  5. Step 5: Solve for x
    x = 27,394,143.86/6,990.80
  6. Step 6: Final answer
    x = 3,918.60

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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.