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Finding the Fourth Proportional to 128.68, 191.81 and 127.46

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Solution

The fourth proportional to 128.68, 191.81 and 127.46 is: 190.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.68 : 191.81 = 127.46 : x
  2. Step 2: Convert to fraction form
    128.68/191.81 = 127.46/x
  3. Step 3: Cross multiply
    128.68x = 191.81 × 127.46
  4. Step 4: Simplify right side
    128.68x = 24,448.90
  5. Step 5: Solve for x
    x = 24,448.90/128.68
  6. Step 6: Final answer
    x = 190.00

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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.