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Finding the Fourth Proportional to 902.98, 1,246.08 and 641.35

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Solution

The fourth proportional to 902.98, 1,246.08 and 641.35 is: 885.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.98 : 1,246.08 = 641.35 : x
  2. Step 2: Convert to fraction form
    902.98/1,246.08 = 641.35/x
  3. Step 3: Cross multiply
    902.98x = 1,246.08 × 641.35
  4. Step 4: Simplify right side
    902.98x = 799,173.41
  5. Step 5: Solve for x
    x = 799,173.41/902.98
  6. Step 6: Final answer
    x = 885.04

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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.