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Finding the Fourth Proportional to 415.50, 626.43 and 393

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Solution

The fourth proportional to 415.50, 626.43 and 393 is: 592.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.50 : 626.43 = 393 : x
  2. Step 2: Convert to fraction form
    415.50/626.43 = 393/x
  3. Step 3: Cross multiply
    415.50x = 626.43 × 393
  4. Step 4: Simplify right side
    415.50x = 246,186.99
  5. Step 5: Solve for x
    x = 246,186.99/415.50
  6. Step 6: Final answer
    x = 592.51

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.