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Finding the Fourth Proportional to 283.45, 391.10 and 171.40

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Solution

The fourth proportional to 283.45, 391.10 and 171.40 is: 236.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.45 : 391.10 = 171.40 : x
  2. Step 2: Convert to fraction form
    283.45/391.10 = 171.40/x
  3. Step 3: Cross multiply
    283.45x = 391.10 × 171.40
  4. Step 4: Simplify right side
    283.45x = 67,034.88
  5. Step 5: Solve for x
    x = 67,034.88/283.45
  6. Step 6: Final answer
    x = 236.50

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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.