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Finding the Fourth Proportional to 395.65, 546.05 and 221

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Solution

The fourth proportional to 395.65, 546.05 and 221 is: 305.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.65 : 546.05 = 221 : x
  2. Step 2: Convert to fraction form
    395.65/546.05 = 221/x
  3. Step 3: Cross multiply
    395.65x = 546.05 × 221
  4. Step 4: Simplify right side
    395.65x = 120,675.95
  5. Step 5: Solve for x
    x = 120,675.95/395.65
  6. Step 6: Final answer
    x = 305.01

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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.