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Finding the Fourth Proportional to 158, 218.09 and 139.64

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Solution

The fourth proportional to 158, 218.09 and 139.64 is: 192.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    158 : 218.09 = 139.64 : x
  2. Step 2: Convert to fraction form
    158/218.09 = 139.64/x
  3. Step 3: Cross multiply
    158x = 218.09 × 139.64
  4. Step 4: Simplify right side
    158x = 30,453.39
  5. Step 5: Solve for x
    x = 30,453.39/158
  6. Step 6: Final answer
    x = 192.74

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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.