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Finding the Fourth Proportional to 187.75, 259.07 and 121.46

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Solution

The fourth proportional to 187.75, 259.07 and 121.46 is: 167.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.75 : 259.07 = 121.46 : x
  2. Step 2: Convert to fraction form
    187.75/259.07 = 121.46/x
  3. Step 3: Cross multiply
    187.75x = 259.07 × 121.46
  4. Step 4: Simplify right side
    187.75x = 31,465.65
  5. Step 5: Solve for x
    x = 31,465.65/187.75
  6. Step 6: Final answer
    x = 167.60

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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.