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Finding the Fourth Proportional to 902.75, 1,246.19 and 640.71

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Solution

The fourth proportional to 902.75, 1,246.19 and 640.71 is: 884.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.75 : 1,246.19 = 640.71 : x
  2. Step 2: Convert to fraction form
    902.75/1,246.19 = 640.71/x
  3. Step 3: Cross multiply
    902.75x = 1,246.19 × 640.71
  4. Step 4: Simplify right side
    902.75x = 798,443.19
  5. Step 5: Solve for x
    x = 798,443.19/902.75
  6. Step 6: Final answer
    x = 884.46

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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.