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Finding the Fourth Proportional to 325.40, 449.34 and 309.84

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Solution

The fourth proportional to 325.40, 449.34 and 309.84 is: 427.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.40 : 449.34 = 309.84 : x
  2. Step 2: Convert to fraction form
    325.40/449.34 = 309.84/x
  3. Step 3: Cross multiply
    325.40x = 449.34 × 309.84
  4. Step 4: Simplify right side
    325.40x = 139,223.51
  5. Step 5: Solve for x
    x = 139,223.51/325.40
  6. Step 6: Final answer
    x = 427.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.