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Finding the Fourth Proportional to 321.75, 444.15 and 228.51

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Solution

The fourth proportional to 321.75, 444.15 and 228.51 is: 315.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.75 : 444.15 = 228.51 : x
  2. Step 2: Convert to fraction form
    321.75/444.15 = 228.51/x
  3. Step 3: Cross multiply
    321.75x = 444.15 × 228.51
  4. Step 4: Simplify right side
    321.75x = 101,492.72
  5. Step 5: Solve for x
    x = 101,492.72/321.75
  6. Step 6: Final answer
    x = 315.44

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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.