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Finding the Fourth Proportional to 388.90, 583.38 and 331.54

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Solution

The fourth proportional to 388.90, 583.38 and 331.54 is: 497.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.90 : 583.38 = 331.54 : x
  2. Step 2: Convert to fraction form
    388.90/583.38 = 331.54/x
  3. Step 3: Cross multiply
    388.90x = 583.38 × 331.54
  4. Step 4: Simplify right side
    388.90x = 193,413.81
  5. Step 5: Solve for x
    x = 193,413.81/388.90
  6. Step 6: Final answer
    x = 497.34

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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.