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Finding the Fourth Proportional to 626.76, 938.90 and 579.50

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Solution

The fourth proportional to 626.76, 938.90 and 579.50 is: 868.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.76 : 938.90 = 579.50 : x
  2. Step 2: Convert to fraction form
    626.76/938.90 = 579.50/x
  3. Step 3: Cross multiply
    626.76x = 938.90 × 579.50
  4. Step 4: Simplify right side
    626.76x = 544,092.55
  5. Step 5: Solve for x
    x = 544,092.55/626.76
  6. Step 6: Final answer
    x = 868.10

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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.