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Finding the Fourth Proportional to 421.87, 633.40 and 216.58

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Solution

The fourth proportional to 421.87, 633.40 and 216.58 is: 325.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.87 : 633.40 = 216.58 : x
  2. Step 2: Convert to fraction form
    421.87/633.40 = 216.58/x
  3. Step 3: Cross multiply
    421.87x = 633.40 × 216.58
  4. Step 4: Simplify right side
    421.87x = 137,181.77
  5. Step 5: Solve for x
    x = 137,181.77/421.87
  6. Step 6: Final answer
    x = 325.18

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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.