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Finding the Fourth Proportional to 626.80, 865.20 and 394.06

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Solution

The fourth proportional to 626.80, 865.20 and 394.06 is: 543.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.80 : 865.20 = 394.06 : x
  2. Step 2: Convert to fraction form
    626.80/865.20 = 394.06/x
  3. Step 3: Cross multiply
    626.80x = 865.20 × 394.06
  4. Step 4: Simplify right side
    626.80x = 340,940.71
  5. Step 5: Solve for x
    x = 340,940.71/626.80
  6. Step 6: Final answer
    x = 543.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.