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Finding the Fourth Proportional to 762.15, 1,143.10 and 214.21

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Solution

The fourth proportional to 762.15, 1,143.10 and 214.21 is: 321.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.15 : 1,143.10 = 214.21 : x
  2. Step 2: Convert to fraction form
    762.15/1,143.10 = 214.21/x
  3. Step 3: Cross multiply
    762.15x = 1,143.10 × 214.21
  4. Step 4: Simplify right side
    762.15x = 244,860.02
  5. Step 5: Solve for x
    x = 244,860.02/762.15
  6. Step 6: Final answer
    x = 321.27

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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.