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Finding the Fourth Proportional to 607.92, 911.25 and 388.70

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Solution

The fourth proportional to 607.92, 911.25 and 388.70 is: 582.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.92 : 911.25 = 388.70 : x
  2. Step 2: Convert to fraction form
    607.92/911.25 = 388.70/x
  3. Step 3: Cross multiply
    607.92x = 911.25 × 388.70
  4. Step 4: Simplify right side
    607.92x = 354,202.88
  5. Step 5: Solve for x
    x = 354,202.88/607.92
  6. Step 6: Final answer
    x = 582.65

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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.