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Finding the Fourth Proportional to 114.24, 157.80 and 81.60

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Solution

The fourth proportional to 114.24, 157.80 and 81.60 is: 112.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.24 : 157.80 = 81.60 : x
  2. Step 2: Convert to fraction form
    114.24/157.80 = 81.60/x
  3. Step 3: Cross multiply
    114.24x = 157.80 × 81.60
  4. Step 4: Simplify right side
    114.24x = 12,876.48
  5. Step 5: Solve for x
    x = 12,876.48/114.24
  6. Step 6: Final answer
    x = 112.71

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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.