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Finding the Fourth Proportional to 187.49, 258.80 and 113.78

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Solution

The fourth proportional to 187.49, 258.80 and 113.78 is: 157.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.49 : 258.80 = 113.78 : x
  2. Step 2: Convert to fraction form
    187.49/258.80 = 113.78/x
  3. Step 3: Cross multiply
    187.49x = 258.80 × 113.78
  4. Step 4: Simplify right side
    187.49x = 29,444.40
  5. Step 5: Solve for x
    x = 29,444.40/187.49
  6. Step 6: Final answer
    x = 157.05

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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.