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Finding the Fourth Proportional to 128.11, 190.93 and 127.91

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Solution

The fourth proportional to 128.11, 190.93 and 127.91 is: 190.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.11 : 190.93 = 127.91 : x
  2. Step 2: Convert to fraction form
    128.11/190.93 = 127.91/x
  3. Step 3: Cross multiply
    128.11x = 190.93 × 127.91
  4. Step 4: Simplify right side
    128.11x = 24,421.86
  5. Step 5: Solve for x
    x = 24,421.86/128.11
  6. Step 6: Final answer
    x = 190.63

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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.