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Finding the Fourth Proportional to 309.80, 427.61 and 178.89

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Solution

The fourth proportional to 309.80, 427.61 and 178.89 is: 246.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.80 : 427.61 = 178.89 : x
  2. Step 2: Convert to fraction form
    309.80/427.61 = 178.89/x
  3. Step 3: Cross multiply
    309.80x = 427.61 × 178.89
  4. Step 4: Simplify right side
    309.80x = 76,494.26
  5. Step 5: Solve for x
    x = 76,494.26/309.80
  6. Step 6: Final answer
    x = 246.92

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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.