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Finding the Fourth Proportional to 901.40, 1,236.94 and 818.24

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Solution

The fourth proportional to 901.40, 1,236.94 and 818.24 is: 1,122.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.40 : 1,236.94 = 818.24 : x
  2. Step 2: Convert to fraction form
    901.40/1,236.94 = 818.24/x
  3. Step 3: Cross multiply
    901.40x = 1,236.94 × 818.24
  4. Step 4: Simplify right side
    901.40x = 1,012,105.56
  5. Step 5: Solve for x
    x = 1,012,105.56/901.40
  6. Step 6: Final answer
    x = 1,122.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.