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Finding the Fourth Proportional to 403.55, 556.90 and 228.90

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Solution

The fourth proportional to 403.55, 556.90 and 228.90 is: 315.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.55 : 556.90 = 228.90 : x
  2. Step 2: Convert to fraction form
    403.55/556.90 = 228.90/x
  3. Step 3: Cross multiply
    403.55x = 556.90 × 228.90
  4. Step 4: Simplify right side
    403.55x = 127,474.41
  5. Step 5: Solve for x
    x = 127,474.41/403.55
  6. Step 6: Final answer
    x = 315.88

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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.