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Finding the Fourth Proportional to 421.81, 632.46 and 216.22

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Solution

The fourth proportional to 421.81, 632.46 and 216.22 is: 324.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.81 : 632.46 = 216.22 : x
  2. Step 2: Convert to fraction form
    421.81/632.46 = 216.22/x
  3. Step 3: Cross multiply
    421.81x = 632.46 × 216.22
  4. Step 4: Simplify right side
    421.81x = 136,750.50
  5. Step 5: Solve for x
    x = 136,750.50/421.81
  6. Step 6: Final answer
    x = 324.20

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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.