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Finding the Fourth Proportional to 186.25, 278.79 and 137.47

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Solution

The fourth proportional to 186.25, 278.79 and 137.47 is: 205.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.25 : 278.79 = 137.47 : x
  2. Step 2: Convert to fraction form
    186.25/278.79 = 137.47/x
  3. Step 3: Cross multiply
    186.25x = 278.79 × 137.47
  4. Step 4: Simplify right side
    186.25x = 38,325.26
  5. Step 5: Solve for x
    x = 38,325.26/186.25
  6. Step 6: Final answer
    x = 205.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.