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Finding the Fourth Proportional to 186.39, 256.61 and 153.59

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Solution

The fourth proportional to 186.39, 256.61 and 153.59 is: 211.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.39 : 256.61 = 153.59 : x
  2. Step 2: Convert to fraction form
    186.39/256.61 = 153.59/x
  3. Step 3: Cross multiply
    186.39x = 256.61 × 153.59
  4. Step 4: Simplify right side
    186.39x = 39,410.68
  5. Step 5: Solve for x
    x = 39,410.68/186.39
  6. Step 6: Final answer
    x = 211.44

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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.