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Finding the Fourth Proportional to 389.21, 582.72 and 251.91

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Solution

The fourth proportional to 389.21, 582.72 and 251.91 is: 377.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.21 : 582.72 = 251.91 : x
  2. Step 2: Convert to fraction form
    389.21/582.72 = 251.91/x
  3. Step 3: Cross multiply
    389.21x = 582.72 × 251.91
  4. Step 4: Simplify right side
    389.21x = 146,793.00
  5. Step 5: Solve for x
    x = 146,793.00/389.21
  6. Step 6: Final answer
    x = 377.16

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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.