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Finding the Fourth Proportional to 190.79, 263.05 and 128.52

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Solution

The fourth proportional to 190.79, 263.05 and 128.52 is: 177.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.79 : 263.05 = 128.52 : x
  2. Step 2: Convert to fraction form
    190.79/263.05 = 128.52/x
  3. Step 3: Cross multiply
    190.79x = 263.05 × 128.52
  4. Step 4: Simplify right side
    190.79x = 33,806.86
  5. Step 5: Solve for x
    x = 33,806.86/190.79
  6. Step 6: Final answer
    x = 177.20

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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.