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Finding the Fourth Proportional to 408.16, 612.48 and 271.28

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Solution

The fourth proportional to 408.16, 612.48 and 271.28 is: 407.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.16 : 612.48 = 271.28 : x
  2. Step 2: Convert to fraction form
    408.16/612.48 = 271.28/x
  3. Step 3: Cross multiply
    408.16x = 612.48 × 271.28
  4. Step 4: Simplify right side
    408.16x = 166,153.57
  5. Step 5: Solve for x
    x = 166,153.57/408.16
  6. Step 6: Final answer
    x = 407.08

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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.