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Finding the Fourth Proportional to 128.01, 192.13 and 121.07

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Solution

The fourth proportional to 128.01, 192.13 and 121.07 is: 181.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.01 : 192.13 = 121.07 : x
  2. Step 2: Convert to fraction form
    128.01/192.13 = 121.07/x
  3. Step 3: Cross multiply
    128.01x = 192.13 × 121.07
  4. Step 4: Simplify right side
    128.01x = 23,261.32
  5. Step 5: Solve for x
    x = 23,261.32/128.01
  6. Step 6: Final answer
    x = 181.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.