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Finding the Fourth Proportional to 79.37, 119.74 and 74.51

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Solution

The fourth proportional to 79.37, 119.74 and 74.51 is: 112.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.37 : 119.74 = 74.51 : x
  2. Step 2: Convert to fraction form
    79.37/119.74 = 74.51/x
  3. Step 3: Cross multiply
    79.37x = 119.74 × 74.51
  4. Step 4: Simplify right side
    79.37x = 8,921.83
  5. Step 5: Solve for x
    x = 8,921.83/79.37
  6. Step 6: Final answer
    x = 112.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.