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Finding the Fourth Proportional to 608.60, 911.75 and 388.95

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Solution

The fourth proportional to 608.60, 911.75 and 388.95 is: 582.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.60 : 911.75 = 388.95 : x
  2. Step 2: Convert to fraction form
    608.60/911.75 = 388.95/x
  3. Step 3: Cross multiply
    608.60x = 911.75 × 388.95
  4. Step 4: Simplify right side
    608.60x = 354,623.22
  5. Step 5: Solve for x
    x = 354,623.22/608.60
  6. Step 6: Final answer
    x = 582.69

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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.