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Finding the Fourth Proportional to 187.21, 258.02 and 143.65

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Solution

The fourth proportional to 187.21, 258.02 and 143.65 is: 197.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.21 : 258.02 = 143.65 : x
  2. Step 2: Convert to fraction form
    187.21/258.02 = 143.65/x
  3. Step 3: Cross multiply
    187.21x = 258.02 × 143.65
  4. Step 4: Simplify right side
    187.21x = 37,063.85
  5. Step 5: Solve for x
    x = 37,063.85/187.21
  6. Step 6: Final answer
    x = 197.98

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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.