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Finding the Fourth Proportional to 129.98, 179.36 and 121.28

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Solution

The fourth proportional to 129.98, 179.36 and 121.28 is: 167.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.98 : 179.36 = 121.28 : x
  2. Step 2: Convert to fraction form
    129.98/179.36 = 121.28/x
  3. Step 3: Cross multiply
    129.98x = 179.36 × 121.28
  4. Step 4: Simplify right side
    129.98x = 21,752.78
  5. Step 5: Solve for x
    x = 21,752.78/129.98
  6. Step 6: Final answer
    x = 167.35

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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.