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Finding the Fourth Proportional to 626.67, 865.05 and 378.20

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Solution

The fourth proportional to 626.67, 865.05 and 378.20 is: 522.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.67 : 865.05 = 378.20 : x
  2. Step 2: Convert to fraction form
    626.67/865.05 = 378.20/x
  3. Step 3: Cross multiply
    626.67x = 865.05 × 378.20
  4. Step 4: Simplify right side
    626.67x = 327,161.91
  5. Step 5: Solve for x
    x = 327,161.91/626.67
  6. Step 6: Final answer
    x = 522.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.