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Finding the Fourth Proportional to 283.78, 391.80 and 231.45

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Solution

The fourth proportional to 283.78, 391.80 and 231.45 is: 319.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.78 : 391.80 = 231.45 : x
  2. Step 2: Convert to fraction form
    283.78/391.80 = 231.45/x
  3. Step 3: Cross multiply
    283.78x = 391.80 × 231.45
  4. Step 4: Simplify right side
    283.78x = 90,682.89
  5. Step 5: Solve for x
    x = 90,682.89/283.78
  6. Step 6: Final answer
    x = 319.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.