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Finding the Fourth Proportional to 365.40, 503.28 and 321.84

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Solution

The fourth proportional to 365.40, 503.28 and 321.84 is: 443.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    365.40 : 503.28 = 321.84 : x
  2. Step 2: Convert to fraction form
    365.40/503.28 = 321.84/x
  3. Step 3: Cross multiply
    365.40x = 503.28 × 321.84
  4. Step 4: Simplify right side
    365.40x = 161,975.64
  5. Step 5: Solve for x
    x = 161,975.64/365.40
  6. Step 6: Final answer
    x = 443.28

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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.