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Finding the Fourth Proportional to 128.35, 176.56 and 118.59

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Solution

The fourth proportional to 128.35, 176.56 and 118.59 is: 163.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.35 : 176.56 = 118.59 : x
  2. Step 2: Convert to fraction form
    128.35/176.56 = 118.59/x
  3. Step 3: Cross multiply
    128.35x = 176.56 × 118.59
  4. Step 4: Simplify right side
    128.35x = 20,938.25
  5. Step 5: Solve for x
    x = 20,938.25/128.35
  6. Step 6: Final answer
    x = 163.13

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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.