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Finding the Fourth Proportional to 235.63, 354.21 and 218.72

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Solution

The fourth proportional to 235.63, 354.21 and 218.72 is: 328.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.63 : 354.21 = 218.72 : x
  2. Step 2: Convert to fraction form
    235.63/354.21 = 218.72/x
  3. Step 3: Cross multiply
    235.63x = 354.21 × 218.72
  4. Step 4: Simplify right side
    235.63x = 77,472.81
  5. Step 5: Solve for x
    x = 77,472.81/235.63
  6. Step 6: Final answer
    x = 328.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.