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Finding the Fourth Proportional to 187.35, 258.28 and 143.09

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Solution

The fourth proportional to 187.35, 258.28 and 143.09 is: 197.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.35 : 258.28 = 143.09 : x
  2. Step 2: Convert to fraction form
    187.35/258.28 = 143.09/x
  3. Step 3: Cross multiply
    187.35x = 258.28 × 143.09
  4. Step 4: Simplify right side
    187.35x = 36,955.64
  5. Step 5: Solve for x
    x = 36,955.64/187.35
  6. Step 6: Final answer
    x = 197.25

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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.