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Finding the Fourth Proportional to 408.50, 612.75 and 104.50

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Solution

The fourth proportional to 408.50, 612.75 and 104.50 is: 156.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.50 : 612.75 = 104.50 : x
  2. Step 2: Convert to fraction form
    408.50/612.75 = 104.50/x
  3. Step 3: Cross multiply
    408.50x = 612.75 × 104.50
  4. Step 4: Simplify right side
    408.50x = 64,032.38
  5. Step 5: Solve for x
    x = 64,032.38/408.50
  6. Step 6: Final answer
    x = 156.75

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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.