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Finding the Fourth Proportional to 626.64, 939.40 and 215.49

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Solution

The fourth proportional to 626.64, 939.40 and 215.49 is: 323.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.64 : 939.40 = 215.49 : x
  2. Step 2: Convert to fraction form
    626.64/939.40 = 215.49/x
  3. Step 3: Cross multiply
    626.64x = 939.40 × 215.49
  4. Step 4: Simplify right side
    626.64x = 202,426.36
  5. Step 5: Solve for x
    x = 202,426.36/626.64
  6. Step 6: Final answer
    x = 323.04

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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.