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Finding the Fourth Proportional to 188.36, 259.94 and 105.45

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Solution

The fourth proportional to 188.36, 259.94 and 105.45 is: 145.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.36 : 259.94 = 105.45 : x
  2. Step 2: Convert to fraction form
    188.36/259.94 = 105.45/x
  3. Step 3: Cross multiply
    188.36x = 259.94 × 105.45
  4. Step 4: Simplify right side
    188.36x = 27,411.42
  5. Step 5: Solve for x
    x = 27,411.42/188.36
  6. Step 6: Final answer
    x = 145.53

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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.