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Finding the Fourth Proportional to 762.96, 1,144.38 and 215.22

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Solution

The fourth proportional to 762.96, 1,144.38 and 215.22 is: 322.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.96 : 1,144.38 = 215.22 : x
  2. Step 2: Convert to fraction form
    762.96/1,144.38 = 215.22/x
  3. Step 3: Cross multiply
    762.96x = 1,144.38 × 215.22
  4. Step 4: Simplify right side
    762.96x = 246,293.46
  5. Step 5: Solve for x
    x = 246,293.46/762.96
  6. Step 6: Final answer
    x = 322.81

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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.