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Finding the Fourth Proportional to 305.88, 421.84 and 261.64

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Solution

The fourth proportional to 305.88, 421.84 and 261.64 is: 360.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.88 : 421.84 = 261.64 : x
  2. Step 2: Convert to fraction form
    305.88/421.84 = 261.64/x
  3. Step 3: Cross multiply
    305.88x = 421.84 × 261.64
  4. Step 4: Simplify right side
    305.88x = 110,370.22
  5. Step 5: Solve for x
    x = 110,370.22/305.88
  6. Step 6: Final answer
    x = 360.83

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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.