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Finding the Fourth Proportional to 128.88, 177.98 and 107.33

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Solution

The fourth proportional to 128.88, 177.98 and 107.33 is: 148.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.88 : 177.98 = 107.33 : x
  2. Step 2: Convert to fraction form
    128.88/177.98 = 107.33/x
  3. Step 3: Cross multiply
    128.88x = 177.98 × 107.33
  4. Step 4: Simplify right side
    128.88x = 19,101.17
  5. Step 5: Solve for x
    x = 19,101.17/128.88
  6. Step 6: Final answer
    x = 148.21

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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.