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Finding the Fourth Proportional to 614.90, 921.80 and 326

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Solution

The fourth proportional to 614.90, 921.80 and 326 is: 488.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.90 : 921.80 = 326 : x
  2. Step 2: Convert to fraction form
    614.90/921.80 = 326/x
  3. Step 3: Cross multiply
    614.90x = 921.80 × 326
  4. Step 4: Simplify right side
    614.90x = 300,506.80
  5. Step 5: Solve for x
    x = 300,506.80/614.90
  6. Step 6: Final answer
    x = 488.71

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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.