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Finding the Fourth Proportional to 403.43, 556.78 and 228.81

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Solution

The fourth proportional to 403.43, 556.78 and 228.81 is: 315.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.43 : 556.78 = 228.81 : x
  2. Step 2: Convert to fraction form
    403.43/556.78 = 228.81/x
  3. Step 3: Cross multiply
    403.43x = 556.78 × 228.81
  4. Step 4: Simplify right side
    403.43x = 127,396.83
  5. Step 5: Solve for x
    x = 127,396.83/403.43
  6. Step 6: Final answer
    x = 315.78

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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.