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Finding the Fourth Proportional to 186.51, 257.39 and 121.13

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Solution

The fourth proportional to 186.51, 257.39 and 121.13 is: 167.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.51 : 257.39 = 121.13 : x
  2. Step 2: Convert to fraction form
    186.51/257.39 = 121.13/x
  3. Step 3: Cross multiply
    186.51x = 257.39 × 121.13
  4. Step 4: Simplify right side
    186.51x = 31,175.76
  5. Step 5: Solve for x
    x = 31,175.76/186.51
  6. Step 6: Final answer
    x = 167.15

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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.