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Finding the Fourth Proportional to 403.30, 556.65 and 228.74

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Solution

The fourth proportional to 403.30, 556.65 and 228.74 is: 315.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.30 : 556.65 = 228.74 : x
  2. Step 2: Convert to fraction form
    403.30/556.65 = 228.74/x
  3. Step 3: Cross multiply
    403.30x = 556.65 × 228.74
  4. Step 4: Simplify right side
    403.30x = 127,328.12
  5. Step 5: Solve for x
    x = 127,328.12/403.30
  6. Step 6: Final answer
    x = 315.72

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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.