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Finding the Fourth Proportional to 397.74, 596.55 and 123.80

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Solution

The fourth proportional to 397.74, 596.55 and 123.80 is: 185.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.74 : 596.55 = 123.80 : x
  2. Step 2: Convert to fraction form
    397.74/596.55 = 123.80/x
  3. Step 3: Cross multiply
    397.74x = 596.55 × 123.80
  4. Step 4: Simplify right side
    397.74x = 73,849.68
  5. Step 5: Solve for x
    x = 73,849.68/397.74
  6. Step 6: Final answer
    x = 185.67

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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.