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Finding the Fourth Proportional to 421.92, 632.40 and 325.44

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Solution

The fourth proportional to 421.92, 632.40 and 325.44 is: 487.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.92 : 632.40 = 325.44 : x
  2. Step 2: Convert to fraction form
    421.92/632.40 = 325.44/x
  3. Step 3: Cross multiply
    421.92x = 632.40 × 325.44
  4. Step 4: Simplify right side
    421.92x = 205,808.26
  5. Step 5: Solve for x
    x = 205,808.26/421.92
  6. Step 6: Final answer
    x = 487.79

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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.