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Finding the Fourth Proportional to 405.43, 559.53 and 228.39

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Solution

The fourth proportional to 405.43, 559.53 and 228.39 is: 315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.43 : 559.53 = 228.39 : x
  2. Step 2: Convert to fraction form
    405.43/559.53 = 228.39/x
  3. Step 3: Cross multiply
    405.43x = 559.53 × 228.39
  4. Step 4: Simplify right side
    405.43x = 127,788.26
  5. Step 5: Solve for x
    x = 127,788.26/405.43
  6. Step 6: Final answer
    x = 315.20

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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.