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Finding the Fourth Proportional to 388.14, 581.42 and 258.22

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Solution

The fourth proportional to 388.14, 581.42 and 258.22 is: 386.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.14 : 581.42 = 258.22 : x
  2. Step 2: Convert to fraction form
    388.14/581.42 = 258.22/x
  3. Step 3: Cross multiply
    388.14x = 581.42 × 258.22
  4. Step 4: Simplify right side
    388.14x = 150,134.27
  5. Step 5: Solve for x
    x = 150,134.27/388.14
  6. Step 6: Final answer
    x = 386.80

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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.