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Finding the Fourth Proportional to 388.70, 583.10 and 193.80

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Solution

The fourth proportional to 388.70, 583.10 and 193.80 is: 290.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.70 : 583.10 = 193.80 : x
  2. Step 2: Convert to fraction form
    388.70/583.10 = 193.80/x
  3. Step 3: Cross multiply
    388.70x = 583.10 × 193.80
  4. Step 4: Simplify right side
    388.70x = 113,004.78
  5. Step 5: Solve for x
    x = 113,004.78/388.70
  6. Step 6: Final answer
    x = 290.72

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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.