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Finding the Fourth Proportional to 187.15, 258.35 and 117.31

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Solution

The fourth proportional to 187.15, 258.35 and 117.31 is: 161.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.15 : 258.35 = 117.31 : x
  2. Step 2: Convert to fraction form
    187.15/258.35 = 117.31/x
  3. Step 3: Cross multiply
    187.15x = 258.35 × 117.31
  4. Step 4: Simplify right side
    187.15x = 30,305.16
  5. Step 5: Solve for x
    x = 30,305.16/187.15
  6. Step 6: Final answer
    x = 161.93

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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.