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Finding the Fourth Proportional to 187.31, 258.51 and 108.64

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Solution

The fourth proportional to 187.31, 258.51 and 108.64 is: 149.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.31 : 258.51 = 108.64 : x
  2. Step 2: Convert to fraction form
    187.31/258.51 = 108.64/x
  3. Step 3: Cross multiply
    187.31x = 258.51 × 108.64
  4. Step 4: Simplify right side
    187.31x = 28,083.23
  5. Step 5: Solve for x
    x = 28,083.23/187.31
  6. Step 6: Final answer
    x = 149.93

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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.