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Finding the Fourth Proportional to 305.64, 421.84 and 261.22

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Solution

The fourth proportional to 305.64, 421.84 and 261.22 is: 360.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.64 : 421.84 = 261.22 : x
  2. Step 2: Convert to fraction form
    305.64/421.84 = 261.22/x
  3. Step 3: Cross multiply
    305.64x = 421.84 × 261.22
  4. Step 4: Simplify right side
    305.64x = 110,193.04
  5. Step 5: Solve for x
    x = 110,193.04/305.64
  6. Step 6: Final answer
    x = 360.53

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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.