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Finding the Fourth Proportional to 627.60, 941.40 and 489.90

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Solution

The fourth proportional to 627.60, 941.40 and 489.90 is: 734.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.60 : 941.40 = 489.90 : x
  2. Step 2: Convert to fraction form
    627.60/941.40 = 489.90/x
  3. Step 3: Cross multiply
    627.60x = 941.40 × 489.90
  4. Step 4: Simplify right side
    627.60x = 461,191.86
  5. Step 5: Solve for x
    x = 461,191.86/627.60
  6. Step 6: Final answer
    x = 734.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.