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Finding the Fourth Proportional to 405.67, 608.50 and 131.78

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Solution

The fourth proportional to 405.67, 608.50 and 131.78 is: 197.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.67 : 608.50 = 131.78 : x
  2. Step 2: Convert to fraction form
    405.67/608.50 = 131.78/x
  3. Step 3: Cross multiply
    405.67x = 608.50 × 131.78
  4. Step 4: Simplify right side
    405.67x = 80,188.13
  5. Step 5: Solve for x
    x = 80,188.13/405.67
  6. Step 6: Final answer
    x = 197.67

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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.