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Finding the Fourth Proportional to 405.54, 559.58 and 257.99

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Solution

The fourth proportional to 405.54, 559.58 and 257.99 is: 355.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.54 : 559.58 = 257.99 : x
  2. Step 2: Convert to fraction form
    405.54/559.58 = 257.99/x
  3. Step 3: Cross multiply
    405.54x = 559.58 × 257.99
  4. Step 4: Simplify right side
    405.54x = 144,361.96
  5. Step 5: Solve for x
    x = 144,361.96/405.54
  6. Step 6: Final answer
    x = 355.97

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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.