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Finding the Fourth Proportional to 818.97, 1,228.38 and 408.36

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Solution

The fourth proportional to 818.97, 1,228.38 and 408.36 is: 612.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.97 : 1,228.38 = 408.36 : x
  2. Step 2: Convert to fraction form
    818.97/1,228.38 = 408.36/x
  3. Step 3: Cross multiply
    818.97x = 1,228.38 × 408.36
  4. Step 4: Simplify right side
    818.97x = 501,621.26
  5. Step 5: Solve for x
    x = 501,621.26/818.97
  6. Step 6: Final answer
    x = 612.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.