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Finding the Fourth Proportional to 128.04, 190.83 and 103.56

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Solution

The fourth proportional to 128.04, 190.83 and 103.56 is: 154.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.04 : 190.83 = 103.56 : x
  2. Step 2: Convert to fraction form
    128.04/190.83 = 103.56/x
  3. Step 3: Cross multiply
    128.04x = 190.83 × 103.56
  4. Step 4: Simplify right side
    128.04x = 19,762.35
  5. Step 5: Solve for x
    x = 19,762.35/128.04
  6. Step 6: Final answer
    x = 154.35

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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.