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Finding the Fourth Proportional to 408.52, 612.06 and 393.40

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Solution

The fourth proportional to 408.52, 612.06 and 393.40 is: 589.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.52 : 612.06 = 393.40 : x
  2. Step 2: Convert to fraction form
    408.52/612.06 = 393.40/x
  3. Step 3: Cross multiply
    408.52x = 612.06 × 393.40
  4. Step 4: Simplify right side
    408.52x = 240,784.40
  5. Step 5: Solve for x
    x = 240,784.40/408.52
  6. Step 6: Final answer
    x = 589.41

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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.