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Finding the Fourth Proportional to 128.00, 191.89 and 51.02

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Solution

The fourth proportional to 128.00, 191.89 and 51.02 is: 76.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.00 : 191.89 = 51.02 : x
  2. Step 2: Convert to fraction form
    128.00/191.89 = 51.02/x
  3. Step 3: Cross multiply
    128.00x = 191.89 × 51.02
  4. Step 4: Simplify right side
    128.00x = 9,789.01
  5. Step 5: Solve for x
    x = 9,789.01/128.00
  6. Step 6: Final answer
    x = 76.48

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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.