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Finding the Fourth Proportional to 187.58, 258.75 and 143.90

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Solution

The fourth proportional to 187.58, 258.75 and 143.90 is: 198.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.58 : 258.75 = 143.90 : x
  2. Step 2: Convert to fraction form
    187.58/258.75 = 143.90/x
  3. Step 3: Cross multiply
    187.58x = 258.75 × 143.90
  4. Step 4: Simplify right side
    187.58x = 37,234.13
  5. Step 5: Solve for x
    x = 37,234.13/187.58
  6. Step 6: Final answer
    x = 198.50

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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.