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Finding the Fourth Proportional to 764.90, 1,147.34 and 277.74

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Solution

The fourth proportional to 764.90, 1,147.34 and 277.74 is: 416.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.90 : 1,147.34 = 277.74 : x
  2. Step 2: Convert to fraction form
    764.90/1,147.34 = 277.74/x
  3. Step 3: Cross multiply
    764.90x = 1,147.34 × 277.74
  4. Step 4: Simplify right side
    764.90x = 318,660.82
  5. Step 5: Solve for x
    x = 318,660.82/764.90
  6. Step 6: Final answer
    x = 416.61

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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.