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Finding the Fourth Proportional to 647.26, 969.60 and 317.56

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Solution

The fourth proportional to 647.26, 969.60 and 317.56 is: 475.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.26 : 969.60 = 317.56 : x
  2. Step 2: Convert to fraction form
    647.26/969.60 = 317.56/x
  3. Step 3: Cross multiply
    647.26x = 969.60 × 317.56
  4. Step 4: Simplify right side
    647.26x = 307,906.18
  5. Step 5: Solve for x
    x = 307,906.18/647.26
  6. Step 6: Final answer
    x = 475.71

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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.