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Finding the Fourth Proportional to 647.30, 969.61 and 338.22

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Solution

The fourth proportional to 647.30, 969.61 and 338.22 is: 506.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.30 : 969.61 = 338.22 : x
  2. Step 2: Convert to fraction form
    647.30/969.61 = 338.22/x
  3. Step 3: Cross multiply
    647.30x = 969.61 × 338.22
  4. Step 4: Simplify right side
    647.30x = 327,942.23
  5. Step 5: Solve for x
    x = 327,942.23/647.30
  6. Step 6: Final answer
    x = 506.63

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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.