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Finding the Fourth Proportional to 403.31, 556.57 and 228.66

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Solution

The fourth proportional to 403.31, 556.57 and 228.66 is: 315.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.31 : 556.57 = 228.66 : x
  2. Step 2: Convert to fraction form
    403.31/556.57 = 228.66/x
  3. Step 3: Cross multiply
    403.31x = 556.57 × 228.66
  4. Step 4: Simplify right side
    403.31x = 127,263.49
  5. Step 5: Solve for x
    x = 127,263.49/403.31
  6. Step 6: Final answer
    x = 315.55

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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.