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Finding the Fourth Proportional to 305.00, 420.89 and 178.94

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Solution

The fourth proportional to 305.00, 420.89 and 178.94 is: 246.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.00 : 420.89 = 178.94 : x
  2. Step 2: Convert to fraction form
    305.00/420.89 = 178.94/x
  3. Step 3: Cross multiply
    305.00x = 420.89 × 178.94
  4. Step 4: Simplify right side
    305.00x = 75,311.06
  5. Step 5: Solve for x
    x = 75,311.06/305.00
  6. Step 6: Final answer
    x = 246.93

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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.