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Finding the Fourth Proportional to 114.27, 157.70 and 86.77

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Solution

The fourth proportional to 114.27, 157.70 and 86.77 is: 119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.27 : 157.70 = 86.77 : x
  2. Step 2: Convert to fraction form
    114.27/157.70 = 86.77/x
  3. Step 3: Cross multiply
    114.27x = 157.70 × 86.77
  4. Step 4: Simplify right side
    114.27x = 13,683.63
  5. Step 5: Solve for x
    x = 13,683.63/114.27
  6. Step 6: Final answer
    x = 119.75

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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.