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Finding the Fourth Proportional to 764.16, 1,147.31 and 394.28

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Solution

The fourth proportional to 764.16, 1,147.31 and 394.28 is: 591.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.16 : 1,147.31 = 394.28 : x
  2. Step 2: Convert to fraction form
    764.16/1,147.31 = 394.28/x
  3. Step 3: Cross multiply
    764.16x = 1,147.31 × 394.28
  4. Step 4: Simplify right side
    764.16x = 452,361.39
  5. Step 5: Solve for x
    x = 452,361.39/764.16
  6. Step 6: Final answer
    x = 591.97

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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.