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Finding the Fourth Proportional to 123.87, 185.57 and 72.54

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Solution

The fourth proportional to 123.87, 185.57 and 72.54 is: 108.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.87 : 185.57 = 72.54 : x
  2. Step 2: Convert to fraction form
    123.87/185.57 = 72.54/x
  3. Step 3: Cross multiply
    123.87x = 185.57 × 72.54
  4. Step 4: Simplify right side
    123.87x = 13,460.32
  5. Step 5: Solve for x
    x = 13,460.32/123.87
  6. Step 6: Final answer
    x = 108.67

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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.