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Finding the Fourth Proportional to 762.40, 1,143.49 and 214.64

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Solution

The fourth proportional to 762.40, 1,143.49 and 214.64 is: 321.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.40 : 1,143.49 = 214.64 : x
  2. Step 2: Convert to fraction form
    762.40/1,143.49 = 214.64/x
  3. Step 3: Cross multiply
    762.40x = 1,143.49 × 214.64
  4. Step 4: Simplify right side
    762.40x = 245,438.69
  5. Step 5: Solve for x
    x = 245,438.69/762.40
  6. Step 6: Final answer
    x = 321.93

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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.