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Finding the Fourth Proportional to 2,615.26, 3,921.75 and 766.34

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Solution

The fourth proportional to 2,615.26, 3,921.75 and 766.34 is: 1,149.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,615.26 : 3,921.75 = 766.34 : x
  2. Step 2: Convert to fraction form
    2,615.26/3,921.75 = 766.34/x
  3. Step 3: Cross multiply
    2,615.26x = 3,921.75 × 766.34
  4. Step 4: Simplify right side
    2,615.26x = 3,005,374.29
  5. Step 5: Solve for x
    x = 3,005,374.29/2,615.26
  6. Step 6: Final answer
    x = 1,149.17

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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.