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Finding the Fourth Proportional to 338.55, 467.40 and 228.20

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Solution

The fourth proportional to 338.55, 467.40 and 228.20 is: 315.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.55 : 467.40 = 228.20 : x
  2. Step 2: Convert to fraction form
    338.55/467.40 = 228.20/x
  3. Step 3: Cross multiply
    338.55x = 467.40 × 228.20
  4. Step 4: Simplify right side
    338.55x = 106,658.34
  5. Step 5: Solve for x
    x = 106,658.34/338.55
  6. Step 6: Final answer
    x = 315.04

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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.