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Finding the Fourth Proportional to 626.31, 938.43 and 215.22

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Solution

The fourth proportional to 626.31, 938.43 and 215.22 is: 322.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.31 : 938.43 = 215.22 : x
  2. Step 2: Convert to fraction form
    626.31/938.43 = 215.22/x
  3. Step 3: Cross multiply
    626.31x = 938.43 × 215.22
  4. Step 4: Simplify right side
    626.31x = 201,966.02
  5. Step 5: Solve for x
    x = 201,966.02/626.31
  6. Step 6: Final answer
    x = 322.47

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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.