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Finding the Fourth Proportional to 2,405.31, 3,608.40 and 739.40

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Solution

The fourth proportional to 2,405.31, 3,608.40 and 739.40 is: 1,109.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,405.31 : 3,608.40 = 739.40 : x
  2. Step 2: Convert to fraction form
    2,405.31/3,608.40 = 739.40/x
  3. Step 3: Cross multiply
    2,405.31x = 3,608.40 × 739.40
  4. Step 4: Simplify right side
    2,405.31x = 2,668,029.22
  5. Step 5: Solve for x
    x = 2,668,029.22/2,405.31
  6. Step 6: Final answer
    x = 1,109.23

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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.