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Finding the Fourth Proportional to 305.43, 421.50 and 189

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Solution

The fourth proportional to 305.43, 421.50 and 189 is: 260.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.43 : 421.50 = 189 : x
  2. Step 2: Convert to fraction form
    305.43/421.50 = 189/x
  3. Step 3: Cross multiply
    305.43x = 421.50 × 189
  4. Step 4: Simplify right side
    305.43x = 79,663.50
  5. Step 5: Solve for x
    x = 79,663.50/305.43
  6. Step 6: Final answer
    x = 260.82

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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.