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Finding the Fourth Proportional to 187.74, 258.84 and 143.46

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Solution

The fourth proportional to 187.74, 258.84 and 143.46 is: 197.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.74 : 258.84 = 143.46 : x
  2. Step 2: Convert to fraction form
    187.74/258.84 = 143.46/x
  3. Step 3: Cross multiply
    187.74x = 258.84 × 143.46
  4. Step 4: Simplify right side
    187.74x = 37,133.19
  5. Step 5: Solve for x
    x = 37,133.19/187.74
  6. Step 6: Final answer
    x = 197.79

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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.