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Finding the Fourth Proportional to 627.18, 865.49 and 347.39

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Solution

The fourth proportional to 627.18, 865.49 and 347.39 is: 479.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.18 : 865.49 = 347.39 : x
  2. Step 2: Convert to fraction form
    627.18/865.49 = 347.39/x
  3. Step 3: Cross multiply
    627.18x = 865.49 × 347.39
  4. Step 4: Simplify right side
    627.18x = 300,659.75
  5. Step 5: Solve for x
    x = 300,659.75/627.18
  6. Step 6: Final answer
    x = 479.39

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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.