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Finding the Fourth Proportional to 405.05, 558.97 and 257.68

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Solution

The fourth proportional to 405.05, 558.97 and 257.68 is: 355.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.05 : 558.97 = 257.68 : x
  2. Step 2: Convert to fraction form
    405.05/558.97 = 257.68/x
  3. Step 3: Cross multiply
    405.05x = 558.97 × 257.68
  4. Step 4: Simplify right side
    405.05x = 144,033.35
  5. Step 5: Solve for x
    x = 144,033.35/405.05
  6. Step 6: Final answer
    x = 355.60

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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.