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Finding the Fourth Proportional to 1,804.90, 2,707.11 and 765.31

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Solution

The fourth proportional to 1,804.90, 2,707.11 and 765.31 is: 1,147.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,804.90 : 2,707.11 = 765.31 : x
  2. Step 2: Convert to fraction form
    1,804.90/2,707.11 = 765.31/x
  3. Step 3: Cross multiply
    1,804.90x = 2,707.11 × 765.31
  4. Step 4: Simplify right side
    1,804.90x = 2,071,778.35
  5. Step 5: Solve for x
    x = 2,071,778.35/1,804.90
  6. Step 6: Final answer
    x = 1,147.86

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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.