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Finding the Fourth Proportional to 79.79, 119.57 and 45.56

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Solution

The fourth proportional to 79.79, 119.57 and 45.56 is: 68.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.79 : 119.57 = 45.56 : x
  2. Step 2: Convert to fraction form
    79.79/119.57 = 45.56/x
  3. Step 3: Cross multiply
    79.79x = 119.57 × 45.56
  4. Step 4: Simplify right side
    79.79x = 5,447.68
  5. Step 5: Solve for x
    x = 5,447.68/79.79
  6. Step 6: Final answer
    x = 68.28

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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.