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Finding the Fourth Proportional to 409.24, 613.86 and 386.56

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Solution

The fourth proportional to 409.24, 613.86 and 386.56 is: 579.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.24 : 613.86 = 386.56 : x
  2. Step 2: Convert to fraction form
    409.24/613.86 = 386.56/x
  3. Step 3: Cross multiply
    409.24x = 613.86 × 386.56
  4. Step 4: Simplify right side
    409.24x = 237,293.72
  5. Step 5: Solve for x
    x = 237,293.72/409.24
  6. Step 6: Final answer
    x = 579.84

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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.