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Finding the Fourth Proportional to 405.36, 558.36 and 378.48

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Solution

The fourth proportional to 405.36, 558.36 and 378.48 is: 521.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.36 : 558.36 = 378.48 : x
  2. Step 2: Convert to fraction form
    405.36/558.36 = 378.48/x
  3. Step 3: Cross multiply
    405.36x = 558.36 × 378.48
  4. Step 4: Simplify right side
    405.36x = 211,328.09
  5. Step 5: Solve for x
    x = 211,328.09/405.36
  6. Step 6: Final answer
    x = 521.33

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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.