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Finding the Fourth Proportional to 763.92, 1,145.80 and 216.13

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Solution

The fourth proportional to 763.92, 1,145.80 and 216.13 is: 324.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.92 : 1,145.80 = 216.13 : x
  2. Step 2: Convert to fraction form
    763.92/1,145.80 = 216.13/x
  3. Step 3: Cross multiply
    763.92x = 1,145.80 × 216.13
  4. Step 4: Simplify right side
    763.92x = 247,634.94
  5. Step 5: Solve for x
    x = 247,634.94/763.92
  6. Step 6: Final answer
    x = 324.16

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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.