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Finding the Fourth Proportional to 627.09, 865.47 and 378.55

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Solution

The fourth proportional to 627.09, 865.47 and 378.55 is: 522.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.09 : 865.47 = 378.55 : x
  2. Step 2: Convert to fraction form
    627.09/865.47 = 378.55/x
  3. Step 3: Cross multiply
    627.09x = 865.47 × 378.55
  4. Step 4: Simplify right side
    627.09x = 327,623.67
  5. Step 5: Solve for x
    x = 327,623.67/627.09
  6. Step 6: Final answer
    x = 522.45

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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.