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Finding the Fourth Proportional to 114.51, 157.89 and 86.82

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Solution

The fourth proportional to 114.51, 157.89 and 86.82 is: 119.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.51 : 157.89 = 86.82 : x
  2. Step 2: Convert to fraction form
    114.51/157.89 = 86.82/x
  3. Step 3: Cross multiply
    114.51x = 157.89 × 86.82
  4. Step 4: Simplify right side
    114.51x = 13,707.58
  5. Step 5: Solve for x
    x = 13,707.58/114.51
  6. Step 6: Final answer
    x = 119.71

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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.