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Finding the Fourth Proportional to 105.39, 157.93 and 79.67

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Solution

The fourth proportional to 105.39, 157.93 and 79.67 is: 119.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.39 : 157.93 = 79.67 : x
  2. Step 2: Convert to fraction form
    105.39/157.93 = 79.67/x
  3. Step 3: Cross multiply
    105.39x = 157.93 × 79.67
  4. Step 4: Simplify right side
    105.39x = 12,582.48
  5. Step 5: Solve for x
    x = 12,582.48/105.39
  6. Step 6: Final answer
    x = 119.39

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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.