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Finding the Fourth Proportional to 405.91, 608.45 and 259.73

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Solution

The fourth proportional to 405.91, 608.45 and 259.73 is: 389.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.91 : 608.45 = 259.73 : x
  2. Step 2: Convert to fraction form
    405.91/608.45 = 259.73/x
  3. Step 3: Cross multiply
    405.91x = 608.45 × 259.73
  4. Step 4: Simplify right side
    405.91x = 158,032.72
  5. Step 5: Solve for x
    x = 158,032.72/405.91
  6. Step 6: Final answer
    x = 389.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.