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Finding the Fourth Proportional to 402.53, 603.79 and 321.53

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Solution

The fourth proportional to 402.53, 603.79 and 321.53 is: 482.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.53 : 603.79 = 321.53 : x
  2. Step 2: Convert to fraction form
    402.53/603.79 = 321.53/x
  3. Step 3: Cross multiply
    402.53x = 603.79 × 321.53
  4. Step 4: Simplify right side
    402.53x = 194,132.78
  5. Step 5: Solve for x
    x = 194,132.78/402.53
  6. Step 6: Final answer
    x = 482.29

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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.