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Finding the Fourth Proportional to 128.40, 175.74 and 125.37

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Solution

The fourth proportional to 128.40, 175.74 and 125.37 is: 171.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.40 : 175.74 = 125.37 : x
  2. Step 2: Convert to fraction form
    128.40/175.74 = 125.37/x
  3. Step 3: Cross multiply
    128.40x = 175.74 × 125.37
  4. Step 4: Simplify right side
    128.40x = 22,032.52
  5. Step 5: Solve for x
    x = 22,032.52/128.40
  6. Step 6: Final answer
    x = 171.59

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.