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Finding the Fourth Proportional to 186.04, 256.78 and 120.70

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Solution

The fourth proportional to 186.04, 256.78 and 120.70 is: 166.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.04 : 256.78 = 120.70 : x
  2. Step 2: Convert to fraction form
    186.04/256.78 = 120.70/x
  3. Step 3: Cross multiply
    186.04x = 256.78 × 120.70
  4. Step 4: Simplify right side
    186.04x = 30,993.35
  5. Step 5: Solve for x
    x = 30,993.35/186.04
  6. Step 6: Final answer
    x = 166.60

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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.