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Finding the Fourth Proportional to 626.29, 939.31 and 215.30

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Solution

The fourth proportional to 626.29, 939.31 and 215.30 is: 322.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.29 : 939.31 = 215.30 : x
  2. Step 2: Convert to fraction form
    626.29/939.31 = 215.30/x
  3. Step 3: Cross multiply
    626.29x = 939.31 × 215.30
  4. Step 4: Simplify right side
    626.29x = 202,235.25
  5. Step 5: Solve for x
    x = 202,235.25/626.29
  6. Step 6: Final answer
    x = 322.91

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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.