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Finding the Fourth Proportional to 388.53, 581.32 and 258.84

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Solution

The fourth proportional to 388.53, 581.32 and 258.84 is: 387.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.53 : 581.32 = 258.84 : x
  2. Step 2: Convert to fraction form
    388.53/581.32 = 258.84/x
  3. Step 3: Cross multiply
    388.53x = 581.32 × 258.84
  4. Step 4: Simplify right side
    388.53x = 150,469.19
  5. Step 5: Solve for x
    x = 150,469.19/388.53
  6. Step 6: Final answer
    x = 387.28

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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.