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Finding the Fourth Proportional to 386.22, 533.20 and 228.90

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Solution

The fourth proportional to 386.22, 533.20 and 228.90 is: 316.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.22 : 533.20 = 228.90 : x
  2. Step 2: Convert to fraction form
    386.22/533.20 = 228.90/x
  3. Step 3: Cross multiply
    386.22x = 533.20 × 228.90
  4. Step 4: Simplify right side
    386.22x = 122,049.48
  5. Step 5: Solve for x
    x = 122,049.48/386.22
  6. Step 6: Final answer
    x = 316.01

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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.