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Finding the Fourth Proportional to 128.73, 177.80 and 92.01

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Solution

The fourth proportional to 128.73, 177.80 and 92.01 is: 127.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.73 : 177.80 = 92.01 : x
  2. Step 2: Convert to fraction form
    128.73/177.80 = 92.01/x
  3. Step 3: Cross multiply
    128.73x = 177.80 × 92.01
  4. Step 4: Simplify right side
    128.73x = 16,358.92
  5. Step 5: Solve for x
    x = 16,358.92/128.73
  6. Step 6: Final answer
    x = 127.08

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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.