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Finding the Fourth Proportional to 128.78, 177.59 and 114.03

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Solution

The fourth proportional to 128.78, 177.59 and 114.03 is: 157.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.78 : 177.59 = 114.03 : x
  2. Step 2: Convert to fraction form
    128.78/177.59 = 114.03/x
  3. Step 3: Cross multiply
    128.78x = 177.59 × 114.03
  4. Step 4: Simplify right side
    128.78x = 20,250.02
  5. Step 5: Solve for x
    x = 20,250.02/128.78
  6. Step 6: Final answer
    x = 157.25

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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.