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Finding the Fourth Proportional to 905.87, 1,351.96 and 818.39

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Solution

The fourth proportional to 905.87, 1,351.96 and 818.39 is: 1,221.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.87 : 1,351.96 = 818.39 : x
  2. Step 2: Convert to fraction form
    905.87/1,351.96 = 818.39/x
  3. Step 3: Cross multiply
    905.87x = 1,351.96 × 818.39
  4. Step 4: Simplify right side
    905.87x = 1,106,430.54
  5. Step 5: Solve for x
    x = 1,106,430.54/905.87
  6. Step 6: Final answer
    x = 1,221.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.