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Finding the Fourth Proportional to 421.38, 631.35 and 216

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Solution

The fourth proportional to 421.38, 631.35 and 216 is: 323.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.38 : 631.35 = 216 : x
  2. Step 2: Convert to fraction form
    421.38/631.35 = 216/x
  3. Step 3: Cross multiply
    421.38x = 631.35 × 216
  4. Step 4: Simplify right side
    421.38x = 136,371.60
  5. Step 5: Solve for x
    x = 136,371.60/421.38
  6. Step 6: Final answer
    x = 323.63

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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.