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Finding the Fourth Proportional to 405.28, 559.34 and 228.28

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Solution

The fourth proportional to 405.28, 559.34 and 228.28 is: 315.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.28 : 559.34 = 228.28 : x
  2. Step 2: Convert to fraction form
    405.28/559.34 = 228.28/x
  3. Step 3: Cross multiply
    405.28x = 559.34 × 228.28
  4. Step 4: Simplify right side
    405.28x = 127,684.18
  5. Step 5: Solve for x
    x = 127,684.18/405.28
  6. Step 6: Final answer
    x = 315.05

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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.