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Finding the Fourth Proportional to 187.36, 258.56 and 113.66

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Solution

The fourth proportional to 187.36, 258.56 and 113.66 is: 156.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.36 : 258.56 = 113.66 : x
  2. Step 2: Convert to fraction form
    187.36/258.56 = 113.66/x
  3. Step 3: Cross multiply
    187.36x = 258.56 × 113.66
  4. Step 4: Simplify right side
    187.36x = 29,387.93
  5. Step 5: Solve for x
    x = 29,387.93/187.36
  6. Step 6: Final answer
    x = 156.85

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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.