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Finding the Fourth Proportional to 305.56, 421.70 and 181.26

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Solution

The fourth proportional to 305.56, 421.70 and 181.26 is: 250.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.56 : 421.70 = 181.26 : x
  2. Step 2: Convert to fraction form
    305.56/421.70 = 181.26/x
  3. Step 3: Cross multiply
    305.56x = 421.70 × 181.26
  4. Step 4: Simplify right side
    305.56x = 76,437.34
  5. Step 5: Solve for x
    x = 76,437.34/305.56
  6. Step 6: Final answer
    x = 250.15

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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.