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Finding the Fourth Proportional to 764.12, 1,146 and 216.15

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Solution

The fourth proportional to 764.12, 1,146 and 216.15 is: 324.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.12 : 1,146 = 216.15 : x
  2. Step 2: Convert to fraction form
    764.12/1,146 = 216.15/x
  3. Step 3: Cross multiply
    764.12x = 1,146 × 216.15
  4. Step 4: Simplify right side
    764.12x = 247,707.90
  5. Step 5: Solve for x
    x = 247,707.90/764.12
  6. Step 6: Final answer
    x = 324.18

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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.