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Finding the Fourth Proportional to 128.15, 177.60 and 125.72

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Solution

The fourth proportional to 128.15, 177.60 and 125.72 is: 174.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.15 : 177.60 = 125.72 : x
  2. Step 2: Convert to fraction form
    128.15/177.60 = 125.72/x
  3. Step 3: Cross multiply
    128.15x = 177.60 × 125.72
  4. Step 4: Simplify right side
    128.15x = 22,327.24
  5. Step 5: Solve for x
    x = 22,327.24/128.15
  6. Step 6: Final answer
    x = 174.23

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.