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Finding the Fourth Proportional to 763.95, 1,145.70 and 216.18

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Solution

The fourth proportional to 763.95, 1,145.70 and 216.18 is: 324.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.95 : 1,145.70 = 216.18 : x
  2. Step 2: Convert to fraction form
    763.95/1,145.70 = 216.18/x
  3. Step 3: Cross multiply
    763.95x = 1,145.70 × 216.18
  4. Step 4: Simplify right side
    763.95x = 247,677.43
  5. Step 5: Solve for x
    x = 247,677.43/763.95
  6. Step 6: Final answer
    x = 324.21

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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.