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Finding the Fourth Proportional to 187.30, 258.49 and 113.59

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Solution

The fourth proportional to 187.30, 258.49 and 113.59 is: 156.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.30 : 258.49 = 113.59 : x
  2. Step 2: Convert to fraction form
    187.30/258.49 = 113.59/x
  3. Step 3: Cross multiply
    187.30x = 258.49 × 113.59
  4. Step 4: Simplify right side
    187.30x = 29,361.88
  5. Step 5: Solve for x
    x = 29,361.88/187.30
  6. Step 6: Final answer
    x = 156.76

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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.