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Finding the Fourth Proportional to 626.94, 865.59 and 391.23

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Solution

The fourth proportional to 626.94, 865.59 and 391.23 is: 540.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.94 : 865.59 = 391.23 : x
  2. Step 2: Convert to fraction form
    626.94/865.59 = 391.23/x
  3. Step 3: Cross multiply
    626.94x = 865.59 × 391.23
  4. Step 4: Simplify right side
    626.94x = 338,644.78
  5. Step 5: Solve for x
    x = 338,644.78/626.94
  6. Step 6: Final answer
    x = 540.16

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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.