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Finding the Fourth Proportional to 305.26, 421.01 and 206.86

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Solution

The fourth proportional to 305.26, 421.01 and 206.86 is: 285.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.26 : 421.01 = 206.86 : x
  2. Step 2: Convert to fraction form
    305.26/421.01 = 206.86/x
  3. Step 3: Cross multiply
    305.26x = 421.01 × 206.86
  4. Step 4: Simplify right side
    305.26x = 87,090.13
  5. Step 5: Solve for x
    x = 87,090.13/305.26
  6. Step 6: Final answer
    x = 285.30

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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.