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Finding the Fourth Proportional to 388.42, 581.59 and 258.08

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Solution

The fourth proportional to 388.42, 581.59 and 258.08 is: 386.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.42 : 581.59 = 258.08 : x
  2. Step 2: Convert to fraction form
    388.42/581.59 = 258.08/x
  3. Step 3: Cross multiply
    388.42x = 581.59 × 258.08
  4. Step 4: Simplify right side
    388.42x = 150,096.75
  5. Step 5: Solve for x
    x = 150,096.75/388.42
  6. Step 6: Final answer
    x = 386.43

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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.