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Finding the Fourth Proportional to 114.40, 157.82 and 81.15

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Solution

The fourth proportional to 114.40, 157.82 and 81.15 is: 111.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.40 : 157.82 = 81.15 : x
  2. Step 2: Convert to fraction form
    114.40/157.82 = 81.15/x
  3. Step 3: Cross multiply
    114.40x = 157.82 × 81.15
  4. Step 4: Simplify right side
    114.40x = 12,806.10
  5. Step 5: Solve for x
    x = 12,806.10/114.40
  6. Step 6: Final answer
    x = 111.94

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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.