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Finding the Fourth Proportional to 403.45, 556.70 and 228.80

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Solution

The fourth proportional to 403.45, 556.70 and 228.80 is: 315.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.45 : 556.70 = 228.80 : x
  2. Step 2: Convert to fraction form
    403.45/556.70 = 228.80/x
  3. Step 3: Cross multiply
    403.45x = 556.70 × 228.80
  4. Step 4: Simplify right side
    403.45x = 127,372.96
  5. Step 5: Solve for x
    x = 127,372.96/403.45
  6. Step 6: Final answer
    x = 315.71

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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.