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Finding the Fourth Proportional to 408.16, 612.16 and 148.20

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Solution

The fourth proportional to 408.16, 612.16 and 148.20 is: 222.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.16 : 612.16 = 148.20 : x
  2. Step 2: Convert to fraction form
    408.16/612.16 = 148.20/x
  3. Step 3: Cross multiply
    408.16x = 612.16 × 148.20
  4. Step 4: Simplify right side
    408.16x = 90,722.11
  5. Step 5: Solve for x
    x = 90,722.11/408.16
  6. Step 6: Final answer
    x = 222.27

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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.