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Finding the Fourth Proportional to 128, 176.94 and 116.62

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Solution

The fourth proportional to 128, 176.94 and 116.62 is: 161.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 176.94 = 116.62 : x
  2. Step 2: Convert to fraction form
    128/176.94 = 116.62/x
  3. Step 3: Cross multiply
    128x = 176.94 × 116.62
  4. Step 4: Simplify right side
    128x = 20,634.74
  5. Step 5: Solve for x
    x = 20,634.74/128
  6. Step 6: Final answer
    x = 161.21

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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.