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Finding the Fourth Proportional to 388.45, 581.52 and 251.09

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Solution

The fourth proportional to 388.45, 581.52 and 251.09 is: 375.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.45 : 581.52 = 251.09 : x
  2. Step 2: Convert to fraction form
    388.45/581.52 = 251.09/x
  3. Step 3: Cross multiply
    388.45x = 581.52 × 251.09
  4. Step 4: Simplify right side
    388.45x = 146,013.86
  5. Step 5: Solve for x
    x = 146,013.86/388.45
  6. Step 6: Final answer
    x = 375.89

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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.