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Finding the Fourth Proportional to 185.69, 256.30 and 120.15

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Solution

The fourth proportional to 185.69, 256.30 and 120.15 is: 165.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.69 : 256.30 = 120.15 : x
  2. Step 2: Convert to fraction form
    185.69/256.30 = 120.15/x
  3. Step 3: Cross multiply
    185.69x = 256.30 × 120.15
  4. Step 4: Simplify right side
    185.69x = 30,794.14
  5. Step 5: Solve for x
    x = 30,794.14/185.69
  6. Step 6: Final answer
    x = 165.83

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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.