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Finding the Fourth Proportional to 408.23, 612.39 and 148.19

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Solution

The fourth proportional to 408.23, 612.39 and 148.19 is: 222.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.23 : 612.39 = 148.19 : x
  2. Step 2: Convert to fraction form
    408.23/612.39 = 148.19/x
  3. Step 3: Cross multiply
    408.23x = 612.39 × 148.19
  4. Step 4: Simplify right side
    408.23x = 90,750.07
  5. Step 5: Solve for x
    x = 90,750.07/408.23
  6. Step 6: Final answer
    x = 222.30

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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.