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Finding the Fourth Proportional to 405.81, 608.32 and 131.70

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Solution

The fourth proportional to 405.81, 608.32 and 131.70 is: 197.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.81 : 608.32 = 131.70 : x
  2. Step 2: Convert to fraction form
    405.81/608.32 = 131.70/x
  3. Step 3: Cross multiply
    405.81x = 608.32 × 131.70
  4. Step 4: Simplify right side
    405.81x = 80,115.74
  5. Step 5: Solve for x
    x = 80,115.74/405.81
  6. Step 6: Final answer
    x = 197.42

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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.