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Finding the Fourth Proportional to 627.30, 938.76 and 478.80

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Solution

The fourth proportional to 627.30, 938.76 and 478.80 is: 716.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.30 : 938.76 = 478.80 : x
  2. Step 2: Convert to fraction form
    627.30/938.76 = 478.80/x
  3. Step 3: Cross multiply
    627.30x = 938.76 × 478.80
  4. Step 4: Simplify right side
    627.30x = 449,478.29
  5. Step 5: Solve for x
    x = 449,478.29/627.30
  6. Step 6: Final answer
    x = 716.53

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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.