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Finding the Fourth Proportional to 626.49, 938.71 and 215.40

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Solution

The fourth proportional to 626.49, 938.71 and 215.40 is: 322.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.49 : 938.71 = 215.40 : x
  2. Step 2: Convert to fraction form
    626.49/938.71 = 215.40/x
  3. Step 3: Cross multiply
    626.49x = 938.71 × 215.40
  4. Step 4: Simplify right side
    626.49x = 202,198.13
  5. Step 5: Solve for x
    x = 202,198.13/626.49
  6. Step 6: Final answer
    x = 322.75

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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.