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Finding the Fourth Proportional to 763.21, 1,144.86 and 215.43

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Solution

The fourth proportional to 763.21, 1,144.86 and 215.43 is: 323.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.21 : 1,144.86 = 215.43 : x
  2. Step 2: Convert to fraction form
    763.21/1,144.86 = 215.43/x
  3. Step 3: Cross multiply
    763.21x = 1,144.86 × 215.43
  4. Step 4: Simplify right side
    763.21x = 246,639.13
  5. Step 5: Solve for x
    x = 246,639.13/763.21
  6. Step 6: Final answer
    x = 323.16

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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.