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Finding the Fourth Proportional to 114.08, 157.20 and 81.28

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Solution

The fourth proportional to 114.08, 157.20 and 81.28 is: 112.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.08 : 157.20 = 81.28 : x
  2. Step 2: Convert to fraction form
    114.08/157.20 = 81.28/x
  3. Step 3: Cross multiply
    114.08x = 157.20 × 81.28
  4. Step 4: Simplify right side
    114.08x = 12,777.22
  5. Step 5: Solve for x
    x = 12,777.22/114.08
  6. Step 6: Final answer
    x = 112.00

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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.