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Finding the Fourth Proportional to 627.39, 865.85 and 378.68

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Solution

The fourth proportional to 627.39, 865.85 and 378.68 is: 522.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.39 : 865.85 = 378.68 : x
  2. Step 2: Convert to fraction form
    627.39/865.85 = 378.68/x
  3. Step 3: Cross multiply
    627.39x = 865.85 × 378.68
  4. Step 4: Simplify right side
    627.39x = 327,873.86
  5. Step 5: Solve for x
    x = 327,873.86/627.39
  6. Step 6: Final answer
    x = 522.60

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Double scale
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1.5x scale

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.