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Finding the Fourth Proportional to 388.75, 583.31 and 193.75

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Solution

The fourth proportional to 388.75, 583.31 and 193.75 is: 290.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.75 : 583.31 = 193.75 : x
  2. Step 2: Convert to fraction form
    388.75/583.31 = 193.75/x
  3. Step 3: Cross multiply
    388.75x = 583.31 × 193.75
  4. Step 4: Simplify right side
    388.75x = 113,013.40
  5. Step 5: Solve for x
    x = 113,013.40/388.75
  6. Step 6: Final answer
    x = 290.71

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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.