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Finding the Fourth Proportional to 190.58, 262.76 and 128.30

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Solution

The fourth proportional to 190.58, 262.76 and 128.30 is: 176.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.58 : 262.76 = 128.30 : x
  2. Step 2: Convert to fraction form
    190.58/262.76 = 128.30/x
  3. Step 3: Cross multiply
    190.58x = 262.76 × 128.30
  4. Step 4: Simplify right side
    190.58x = 33,712.11
  5. Step 5: Solve for x
    x = 33,712.11/190.58
  6. Step 6: Final answer
    x = 176.89

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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.