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Finding the Fourth Proportional to 764.89, 1,147.34 and 187.76

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Solution

The fourth proportional to 764.89, 1,147.34 and 187.76 is: 281.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.89 : 1,147.34 = 187.76 : x
  2. Step 2: Convert to fraction form
    764.89/1,147.34 = 187.76/x
  3. Step 3: Cross multiply
    764.89x = 1,147.34 × 187.76
  4. Step 4: Simplify right side
    764.89x = 215,427.90
  5. Step 5: Solve for x
    x = 215,427.90/764.89
  6. Step 6: Final answer
    x = 281.65

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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.