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Finding the Fourth Proportional to 186.95, 257.98 and 121.49

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Solution

The fourth proportional to 186.95, 257.98 and 121.49 is: 167.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.95 : 257.98 = 121.49 : x
  2. Step 2: Convert to fraction form
    186.95/257.98 = 121.49/x
  3. Step 3: Cross multiply
    186.95x = 257.98 × 121.49
  4. Step 4: Simplify right side
    186.95x = 31,341.99
  5. Step 5: Solve for x
    x = 31,341.99/186.95
  6. Step 6: Final answer
    x = 167.65

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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.