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Finding the Fourth Proportional to 128.74, 177.54 and 92.08

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Solution

The fourth proportional to 128.74, 177.54 and 92.08 is: 126.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.74 : 177.54 = 92.08 : x
  2. Step 2: Convert to fraction form
    128.74/177.54 = 92.08/x
  3. Step 3: Cross multiply
    128.74x = 177.54 × 92.08
  4. Step 4: Simplify right side
    128.74x = 16,347.88
  5. Step 5: Solve for x
    x = 16,347.88/128.74
  6. Step 6: Final answer
    x = 126.98

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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.