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Finding the Fourth Proportional to 391.48, 587.22 and 263.80

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Solution

The fourth proportional to 391.48, 587.22 and 263.80 is: 395.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.48 : 587.22 = 263.80 : x
  2. Step 2: Convert to fraction form
    391.48/587.22 = 263.80/x
  3. Step 3: Cross multiply
    391.48x = 587.22 × 263.80
  4. Step 4: Simplify right side
    391.48x = 154,908.64
  5. Step 5: Solve for x
    x = 154,908.64/391.48
  6. Step 6: Final answer
    x = 395.70

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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.