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Finding the Fourth Proportional to 405.86, 608.81 and 149.30

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Solution

The fourth proportional to 405.86, 608.81 and 149.30 is: 223.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.86 : 608.81 = 149.30 : x
  2. Step 2: Convert to fraction form
    405.86/608.81 = 149.30/x
  3. Step 3: Cross multiply
    405.86x = 608.81 × 149.30
  4. Step 4: Simplify right side
    405.86x = 90,895.33
  5. Step 5: Solve for x
    x = 90,895.33/405.86
  6. Step 6: Final answer
    x = 223.96

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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.