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Finding the Fourth Proportional to 279.86, 419.93 and 170.43

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Solution

The fourth proportional to 279.86, 419.93 and 170.43 is: 255.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.86 : 419.93 = 170.43 : x
  2. Step 2: Convert to fraction form
    279.86/419.93 = 170.43/x
  3. Step 3: Cross multiply
    279.86x = 419.93 × 170.43
  4. Step 4: Simplify right side
    279.86x = 71,568.67
  5. Step 5: Solve for x
    x = 71,568.67/279.86
  6. Step 6: Final answer
    x = 255.73

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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.