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Finding the Fourth Proportional to 305.53, 421.67 and 189.11

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Solution

The fourth proportional to 305.53, 421.67 and 189.11 is: 261.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.53 : 421.67 = 189.11 : x
  2. Step 2: Convert to fraction form
    305.53/421.67 = 189.11/x
  3. Step 3: Cross multiply
    305.53x = 421.67 × 189.11
  4. Step 4: Simplify right side
    305.53x = 79,742.01
  5. Step 5: Solve for x
    x = 79,742.01/305.53
  6. Step 6: Final answer
    x = 261.00

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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.