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Finding the Fourth Proportional to 2,405.80, 3,608.90 and 762.30

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Solution

The fourth proportional to 2,405.80, 3,608.90 and 762.30 is: 1,143.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,405.80 : 3,608.90 = 762.30 : x
  2. Step 2: Convert to fraction form
    2,405.80/3,608.90 = 762.30/x
  3. Step 3: Cross multiply
    2,405.80x = 3,608.90 × 762.30
  4. Step 4: Simplify right side
    2,405.80x = 2,751,064.47
  5. Step 5: Solve for x
    x = 2,751,064.47/2,405.80
  6. Step 6: Final answer
    x = 1,143.51

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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.