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Finding the Fourth Proportional to 388.56, 581.90 and 251.40

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Solution

The fourth proportional to 388.56, 581.90 and 251.40 is: 376.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.56 : 581.90 = 251.40 : x
  2. Step 2: Convert to fraction form
    388.56/581.90 = 251.40/x
  3. Step 3: Cross multiply
    388.56x = 581.90 × 251.40
  4. Step 4: Simplify right side
    388.56x = 146,288.40
  5. Step 5: Solve for x
    x = 146,288.40/388.56
  6. Step 6: Final answer
    x = 376.49

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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.