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Finding the Fourth Proportional to 764.12, 1,146.20 and 216.25

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Solution

The fourth proportional to 764.12, 1,146.20 and 216.25 is: 324.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.12 : 1,146.20 = 216.25 : x
  2. Step 2: Convert to fraction form
    764.12/1,146.20 = 216.25/x
  3. Step 3: Cross multiply
    764.12x = 1,146.20 × 216.25
  4. Step 4: Simplify right side
    764.12x = 247,861.99
  5. Step 5: Solve for x
    x = 247,861.99/764.12
  6. Step 6: Final answer
    x = 324.38

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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.