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Finding the Fourth Proportional to 764.43, 1,146.64 and 187.30

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Solution

The fourth proportional to 764.43, 1,146.64 and 187.30 is: 280.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.43 : 1,146.64 = 187.30 : x
  2. Step 2: Convert to fraction form
    764.43/1,146.64 = 187.30/x
  3. Step 3: Cross multiply
    764.43x = 1,146.64 × 187.30
  4. Step 4: Simplify right side
    764.43x = 214,765.67
  5. Step 5: Solve for x
    x = 214,765.67/764.43
  6. Step 6: Final answer
    x = 280.95

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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.