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Finding the Fourth Proportional to 627.60, 866.16 and 394.68

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Solution

The fourth proportional to 627.60, 866.16 and 394.68 is: 544.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.60 : 866.16 = 394.68 : x
  2. Step 2: Convert to fraction form
    627.60/866.16 = 394.68/x
  3. Step 3: Cross multiply
    627.60x = 866.16 × 394.68
  4. Step 4: Simplify right side
    627.60x = 341,856.03
  5. Step 5: Solve for x
    x = 341,856.03/627.60
  6. Step 6: Final answer
    x = 544.70

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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.