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Finding the Fourth Proportional to 405.21, 559.15 and 228.18

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Solution

The fourth proportional to 405.21, 559.15 and 228.18 is: 314.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.21 : 559.15 = 228.18 : x
  2. Step 2: Convert to fraction form
    405.21/559.15 = 228.18/x
  3. Step 3: Cross multiply
    405.21x = 559.15 × 228.18
  4. Step 4: Simplify right side
    405.21x = 127,586.85
  5. Step 5: Solve for x
    x = 127,586.85/405.21
  6. Step 6: Final answer
    x = 314.87

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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.