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Finding the Fourth Proportional to 186, 256.71 and 108.36

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Solution

The fourth proportional to 186, 256.71 and 108.36 is: 149.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    186 : 256.71 = 108.36 : x
  2. Step 2: Convert to fraction form
    186/256.71 = 108.36/x
  3. Step 3: Cross multiply
    186x = 256.71 × 108.36
  4. Step 4: Simplify right side
    186x = 27,817.10
  5. Step 5: Solve for x
    x = 27,817.10/186
  6. Step 6: Final answer
    x = 149.55

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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.