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Finding the Fourth Proportional to 188.08, 259.45 and 122.61

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Solution

The fourth proportional to 188.08, 259.45 and 122.61 is: 169.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.08 : 259.45 = 122.61 : x
  2. Step 2: Convert to fraction form
    188.08/259.45 = 122.61/x
  3. Step 3: Cross multiply
    188.08x = 259.45 × 122.61
  4. Step 4: Simplify right side
    188.08x = 31,811.16
  5. Step 5: Solve for x
    x = 31,811.16/188.08
  6. Step 6: Final answer
    x = 169.14

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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.