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Finding the Fourth Proportional to 627.80, 939.90 and 555.80

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Solution

The fourth proportional to 627.80, 939.90 and 555.80 is: 832.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.80 : 939.90 = 555.80 : x
  2. Step 2: Convert to fraction form
    627.80/939.90 = 555.80/x
  3. Step 3: Cross multiply
    627.80x = 939.90 × 555.80
  4. Step 4: Simplify right side
    627.80x = 522,396.42
  5. Step 5: Solve for x
    x = 522,396.42/627.80
  6. Step 6: Final answer
    x = 832.11

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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.