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Finding the Fourth Proportional to 421.85, 632.64 and 216.65

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Solution

The fourth proportional to 421.85, 632.64 and 216.65 is: 324.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.85 : 632.64 = 216.65 : x
  2. Step 2: Convert to fraction form
    421.85/632.64 = 216.65/x
  3. Step 3: Cross multiply
    421.85x = 632.64 × 216.65
  4. Step 4: Simplify right side
    421.85x = 137,061.46
  5. Step 5: Solve for x
    x = 137,061.46/421.85
  6. Step 6: Final answer
    x = 324.91

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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.