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Finding the Fourth Proportional to 188.14, 258.78 and 158.98

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Solution

The fourth proportional to 188.14, 258.78 and 158.98 is: 218.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.14 : 258.78 = 158.98 : x
  2. Step 2: Convert to fraction form
    188.14/258.78 = 158.98/x
  3. Step 3: Cross multiply
    188.14x = 258.78 × 158.98
  4. Step 4: Simplify right side
    188.14x = 41,140.84
  5. Step 5: Solve for x
    x = 41,140.84/188.14
  6. Step 6: Final answer
    x = 218.67

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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.