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Finding the Fourth Proportional to 190.69, 262.86 and 128.50

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Solution

The fourth proportional to 190.69, 262.86 and 128.50 is: 177.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.69 : 262.86 = 128.50 : x
  2. Step 2: Convert to fraction form
    190.69/262.86 = 128.50/x
  3. Step 3: Cross multiply
    190.69x = 262.86 × 128.50
  4. Step 4: Simplify right side
    190.69x = 33,777.51
  5. Step 5: Solve for x
    x = 33,777.51/190.69
  6. Step 6: Final answer
    x = 177.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.