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Finding the Fourth Proportional to 305.76, 422 and 189.36

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Solution

The fourth proportional to 305.76, 422 and 189.36 is: 261.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.76 : 422 = 189.36 : x
  2. Step 2: Convert to fraction form
    305.76/422 = 189.36/x
  3. Step 3: Cross multiply
    305.76x = 422 × 189.36
  4. Step 4: Simplify right side
    305.76x = 79,909.92
  5. Step 5: Solve for x
    x = 79,909.92/305.76
  6. Step 6: Final answer
    x = 261.35

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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.