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Finding the Fourth Proportional to 390.44, 585.36 and 251.64

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Solution

The fourth proportional to 390.44, 585.36 and 251.64 is: 377.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.44 : 585.36 = 251.64 : x
  2. Step 2: Convert to fraction form
    390.44/585.36 = 251.64/x
  3. Step 3: Cross multiply
    390.44x = 585.36 × 251.64
  4. Step 4: Simplify right side
    390.44x = 147,299.99
  5. Step 5: Solve for x
    x = 147,299.99/390.44
  6. Step 6: Final answer
    x = 377.26

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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.