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Finding the Fourth Proportional to 764.91, 1,147.37 and 187.79

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Solution

The fourth proportional to 764.91, 1,147.37 and 187.79 is: 281.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.91 : 1,147.37 = 187.79 : x
  2. Step 2: Convert to fraction form
    764.91/1,147.37 = 187.79/x
  3. Step 3: Cross multiply
    764.91x = 1,147.37 × 187.79
  4. Step 4: Simplify right side
    764.91x = 215,457.94
  5. Step 5: Solve for x
    x = 215,457.94/764.91
  6. Step 6: Final answer
    x = 281.68

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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.