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Finding the Fourth Proportional to 762.31, 1,143.36 and 214.55

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Solution

The fourth proportional to 762.31, 1,143.36 and 214.55 is: 321.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.31 : 1,143.36 = 214.55 : x
  2. Step 2: Convert to fraction form
    762.31/1,143.36 = 214.55/x
  3. Step 3: Cross multiply
    762.31x = 1,143.36 × 214.55
  4. Step 4: Simplify right side
    762.31x = 245,301.10
  5. Step 5: Solve for x
    x = 245,301.10/762.31
  6. Step 6: Final answer
    x = 321.79

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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.