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Finding the Fourth Proportional to 262.80, 391.77 and 251.91

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Solution

The fourth proportional to 262.80, 391.77 and 251.91 is: 375.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.80 : 391.77 = 251.91 : x
  2. Step 2: Convert to fraction form
    262.80/391.77 = 251.91/x
  3. Step 3: Cross multiply
    262.80x = 391.77 × 251.91
  4. Step 4: Simplify right side
    262.80x = 98,690.78
  5. Step 5: Solve for x
    x = 98,690.78/262.80
  6. Step 6: Final answer
    x = 375.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.