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Finding the Fourth Proportional to 421.83, 632.36 and 216.65

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Solution

The fourth proportional to 421.83, 632.36 and 216.65 is: 324.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.83 : 632.36 = 216.65 : x
  2. Step 2: Convert to fraction form
    421.83/632.36 = 216.65/x
  3. Step 3: Cross multiply
    421.83x = 632.36 × 216.65
  4. Step 4: Simplify right side
    421.83x = 137,000.79
  5. Step 5: Solve for x
    x = 137,000.79/421.83
  6. Step 6: Final answer
    x = 324.78

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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.