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Finding the Fourth Proportional to 309.65, 427.21 and 178.56

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Solution

The fourth proportional to 309.65, 427.21 and 178.56 is: 246.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.65 : 427.21 = 178.56 : x
  2. Step 2: Convert to fraction form
    309.65/427.21 = 178.56/x
  3. Step 3: Cross multiply
    309.65x = 427.21 × 178.56
  4. Step 4: Simplify right side
    309.65x = 76,282.17
  5. Step 5: Solve for x
    x = 76,282.17/309.65
  6. Step 6: Final answer
    x = 246.35

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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.