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Finding the Fourth Proportional to 145, 199.92 and 118.74

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Solution

The fourth proportional to 145, 199.92 and 118.74 is: 163.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    145 : 199.92 = 118.74 : x
  2. Step 2: Convert to fraction form
    145/199.92 = 118.74/x
  3. Step 3: Cross multiply
    145x = 199.92 × 118.74
  4. Step 4: Simplify right side
    145x = 23,738.50
  5. Step 5: Solve for x
    x = 23,738.50/145
  6. Step 6: Final answer
    x = 163.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.