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Finding the Fourth Proportional to 187.20, 258.35 and 104.31

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Solution

The fourth proportional to 187.20, 258.35 and 104.31 is: 143.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.20 : 258.35 = 104.31 : x
  2. Step 2: Convert to fraction form
    187.20/258.35 = 104.31/x
  3. Step 3: Cross multiply
    187.20x = 258.35 × 104.31
  4. Step 4: Simplify right side
    187.20x = 26,948.49
  5. Step 5: Solve for x
    x = 26,948.49/187.20
  6. Step 6: Final answer
    x = 143.96

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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.