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Finding the Fourth Proportional to 123.50, 185.20 and 61.80

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Solution

The fourth proportional to 123.50, 185.20 and 61.80 is: 92.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.50 : 185.20 = 61.80 : x
  2. Step 2: Convert to fraction form
    123.50/185.20 = 61.80/x
  3. Step 3: Cross multiply
    123.50x = 185.20 × 61.80
  4. Step 4: Simplify right side
    123.50x = 11,445.36
  5. Step 5: Solve for x
    x = 11,445.36/123.50
  6. Step 6: Final answer
    x = 92.67

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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.