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Finding the Fourth Proportional to 105.15, 157.79 and 57.09

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Solution

The fourth proportional to 105.15, 157.79 and 57.09 is: 85.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.15 : 157.79 = 57.09 : x
  2. Step 2: Convert to fraction form
    105.15/157.79 = 57.09/x
  3. Step 3: Cross multiply
    105.15x = 157.79 × 57.09
  4. Step 4: Simplify right side
    105.15x = 9,008.23
  5. Step 5: Solve for x
    x = 9,008.23/105.15
  6. Step 6: Final answer
    x = 85.67

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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.