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Finding the Fourth Proportional to 405.44, 608.21 and 131.56

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Solution

The fourth proportional to 405.44, 608.21 and 131.56 is: 197.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.44 : 608.21 = 131.56 : x
  2. Step 2: Convert to fraction form
    405.44/608.21 = 131.56/x
  3. Step 3: Cross multiply
    405.44x = 608.21 × 131.56
  4. Step 4: Simplify right side
    405.44x = 80,014.42
  5. Step 5: Solve for x
    x = 80,014.42/405.44
  6. Step 6: Final answer
    x = 197.35

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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.