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Finding the Fourth Proportional to 818.54, 1,228.62 and 386

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Solution

The fourth proportional to 818.54, 1,228.62 and 386 is: 579.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.54 : 1,228.62 = 386 : x
  2. Step 2: Convert to fraction form
    818.54/1,228.62 = 386/x
  3. Step 3: Cross multiply
    818.54x = 1,228.62 × 386
  4. Step 4: Simplify right side
    818.54x = 474,247.32
  5. Step 5: Solve for x
    x = 474,247.32/818.54
  6. Step 6: Final answer
    x = 579.38

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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.