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Finding the Fourth Proportional to 762.78, 1,144.15 and 215.11

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Solution

The fourth proportional to 762.78, 1,144.15 and 215.11 is: 322.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.78 : 1,144.15 = 215.11 : x
  2. Step 2: Convert to fraction form
    762.78/1,144.15 = 215.11/x
  3. Step 3: Cross multiply
    762.78x = 1,144.15 × 215.11
  4. Step 4: Simplify right side
    762.78x = 246,118.11
  5. Step 5: Solve for x
    x = 246,118.11/762.78
  6. Step 6: Final answer
    x = 322.66

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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.