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Finding the Fourth Proportional to 388.09, 581.84 and 205.70

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Solution

The fourth proportional to 388.09, 581.84 and 205.70 is: 308.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.09 : 581.84 = 205.70 : x
  2. Step 2: Convert to fraction form
    388.09/581.84 = 205.70/x
  3. Step 3: Cross multiply
    388.09x = 581.84 × 205.70
  4. Step 4: Simplify right side
    388.09x = 119,683.46
  5. Step 5: Solve for x
    x = 119,683.46/388.09
  6. Step 6: Final answer
    x = 308.39

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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.