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Finding the Fourth Proportional to 421.73, 632.74 and 216.39

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Solution

The fourth proportional to 421.73, 632.74 and 216.39 is: 324.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.73 : 632.74 = 216.39 : x
  2. Step 2: Convert to fraction form
    421.73/632.74 = 216.39/x
  3. Step 3: Cross multiply
    421.73x = 632.74 × 216.39
  4. Step 4: Simplify right side
    421.73x = 136,917.53
  5. Step 5: Solve for x
    x = 136,917.53/421.73
  6. Step 6: Final answer
    x = 324.66

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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.