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Finding the Fourth Proportional to 1,691.28, 2,536.31 and 766.06

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Solution

The fourth proportional to 1,691.28, 2,536.31 and 766.06 is: 1,148.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691.28 : 2,536.31 = 766.06 : x
  2. Step 2: Convert to fraction form
    1,691.28/2,536.31 = 766.06/x
  3. Step 3: Cross multiply
    1,691.28x = 2,536.31 × 766.06
  4. Step 4: Simplify right side
    1,691.28x = 1,942,961.21
  5. Step 5: Solve for x
    x = 1,942,961.21/1,691.28
  6. Step 6: Final answer
    x = 1,148.81

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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.