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Finding the Fourth Proportional to 305.72, 421.89 and 165.83

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Solution

The fourth proportional to 305.72, 421.89 and 165.83 is: 228.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.72 : 421.89 = 165.83 : x
  2. Step 2: Convert to fraction form
    305.72/421.89 = 165.83/x
  3. Step 3: Cross multiply
    305.72x = 421.89 × 165.83
  4. Step 4: Simplify right side
    305.72x = 69,962.66
  5. Step 5: Solve for x
    x = 69,962.66/305.72
  6. Step 6: Final answer
    x = 228.85

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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.