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Finding the Fourth Proportional to 901.68, 1,243.97 and 636.51

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Solution

The fourth proportional to 901.68, 1,243.97 and 636.51 is: 878.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.68 : 1,243.97 = 636.51 : x
  2. Step 2: Convert to fraction form
    901.68/1,243.97 = 636.51/x
  3. Step 3: Cross multiply
    901.68x = 1,243.97 × 636.51
  4. Step 4: Simplify right side
    901.68x = 791,797.11
  5. Step 5: Solve for x
    x = 791,797.11/901.68
  6. Step 6: Final answer
    x = 878.13

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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.