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Finding the Fourth Proportional to 626.80, 939.60 and 487.90

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Solution

The fourth proportional to 626.80, 939.60 and 487.90 is: 731.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.80 : 939.60 = 487.90 : x
  2. Step 2: Convert to fraction form
    626.80/939.60 = 487.90/x
  3. Step 3: Cross multiply
    626.80x = 939.60 × 487.90
  4. Step 4: Simplify right side
    626.80x = 458,430.84
  5. Step 5: Solve for x
    x = 458,430.84/626.80
  6. Step 6: Final answer
    x = 731.38

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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.