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Finding the Fourth Proportional to 129.33, 179.28 and 121.05

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Solution

The fourth proportional to 129.33, 179.28 and 121.05 is: 167.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.33 : 179.28 = 121.05 : x
  2. Step 2: Convert to fraction form
    129.33/179.28 = 121.05/x
  3. Step 3: Cross multiply
    129.33x = 179.28 × 121.05
  4. Step 4: Simplify right side
    129.33x = 21,701.84
  5. Step 5: Solve for x
    x = 21,701.84/129.33
  6. Step 6: Final answer
    x = 167.80

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.