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Finding the Fourth Proportional to 188.34, 259.89 and 105.43

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Solution

The fourth proportional to 188.34, 259.89 and 105.43 is: 145.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.34 : 259.89 = 105.43 : x
  2. Step 2: Convert to fraction form
    188.34/259.89 = 105.43/x
  3. Step 3: Cross multiply
    188.34x = 259.89 × 105.43
  4. Step 4: Simplify right side
    188.34x = 27,400.20
  5. Step 5: Solve for x
    x = 27,400.20/188.34
  6. Step 6: Final answer
    x = 145.48

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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.