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Finding the Fourth Proportional to 395.72, 546.08 and 218.68

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Solution

The fourth proportional to 395.72, 546.08 and 218.68 is: 301.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.72 : 546.08 = 218.68 : x
  2. Step 2: Convert to fraction form
    395.72/546.08 = 218.68/x
  3. Step 3: Cross multiply
    395.72x = 546.08 × 218.68
  4. Step 4: Simplify right side
    395.72x = 119,416.77
  5. Step 5: Solve for x
    x = 119,416.77/395.72
  6. Step 6: Final answer
    x = 301.77

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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.