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Finding the Fourth Proportional to 901.89, 1,243.08 and 636.42

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Solution

The fourth proportional to 901.89, 1,243.08 and 636.42 is: 877.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.89 : 1,243.08 = 636.42 : x
  2. Step 2: Convert to fraction form
    901.89/1,243.08 = 636.42/x
  3. Step 3: Cross multiply
    901.89x = 1,243.08 × 636.42
  4. Step 4: Simplify right side
    901.89x = 791,120.97
  5. Step 5: Solve for x
    x = 791,120.97/901.89
  6. Step 6: Final answer
    x = 877.18

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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.