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Finding the Fourth Proportional to 205.86, 308.60 and 84.10

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Solution

The fourth proportional to 205.86, 308.60 and 84.10 is: 126.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.86 : 308.60 = 84.10 : x
  2. Step 2: Convert to fraction form
    205.86/308.60 = 84.10/x
  3. Step 3: Cross multiply
    205.86x = 308.60 × 84.10
  4. Step 4: Simplify right side
    205.86x = 25,953.26
  5. Step 5: Solve for x
    x = 25,953.26/205.86
  6. Step 6: Final answer
    x = 126.07

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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.