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Finding the Fourth Proportional to 128.49, 191.72 and 122.48

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Solution

The fourth proportional to 128.49, 191.72 and 122.48 is: 182.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.49 : 191.72 = 122.48 : x
  2. Step 2: Convert to fraction form
    128.49/191.72 = 122.48/x
  3. Step 3: Cross multiply
    128.49x = 191.72 × 122.48
  4. Step 4: Simplify right side
    128.49x = 23,482.19
  5. Step 5: Solve for x
    x = 23,482.19/128.49
  6. Step 6: Final answer
    x = 182.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.