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Finding the Fourth Proportional to 627.60, 854.40 and 627.60

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Solution

The fourth proportional to 627.60, 854.40 and 627.60 is: 854.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.60 : 854.40 = 627.60 : x
  2. Step 2: Convert to fraction form
    627.60/854.40 = 627.60/x
  3. Step 3: Cross multiply
    627.60x = 854.40 × 627.60
  4. Step 4: Simplify right side
    627.60x = 536,221.44
  5. Step 5: Solve for x
    x = 536,221.44/627.60
  6. Step 6: Final answer
    x = 854.40

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.