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Finding the Fourth Proportional to 902.88, 1,244.26 and 640.44

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Solution

The fourth proportional to 902.88, 1,244.26 and 640.44 is: 882.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.88 : 1,244.26 = 640.44 : x
  2. Step 2: Convert to fraction form
    902.88/1,244.26 = 640.44/x
  3. Step 3: Cross multiply
    902.88x = 1,244.26 × 640.44
  4. Step 4: Simplify right side
    902.88x = 796,874.67
  5. Step 5: Solve for x
    x = 796,874.67/902.88
  6. Step 6: Final answer
    x = 882.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.