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Finding the Fourth Proportional to 763.75, 1,145.49 and 215.80

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Solution

The fourth proportional to 763.75, 1,145.49 and 215.80 is: 323.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.75 : 1,145.49 = 215.80 : x
  2. Step 2: Convert to fraction form
    763.75/1,145.49 = 215.80/x
  3. Step 3: Cross multiply
    763.75x = 1,145.49 × 215.80
  4. Step 4: Simplify right side
    763.75x = 247,195.66
  5. Step 5: Solve for x
    x = 247,195.66/763.75
  6. Step 6: Final answer
    x = 323.66

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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.