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Finding the Fourth Proportional to 608.78, 911.68 and 388.64

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Solution

The fourth proportional to 608.78, 911.68 and 388.64 is: 582.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.78 : 911.68 = 388.64 : x
  2. Step 2: Convert to fraction form
    608.78/911.68 = 388.64/x
  3. Step 3: Cross multiply
    608.78x = 911.68 × 388.64
  4. Step 4: Simplify right side
    608.78x = 354,315.32
  5. Step 5: Solve for x
    x = 354,315.32/608.78
  6. Step 6: Final answer
    x = 582.01

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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.