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Finding the Fourth Proportional to 153.26, 211.76 and 121.84

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Solution

The fourth proportional to 153.26, 211.76 and 121.84 is: 168.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.26 : 211.76 = 121.84 : x
  2. Step 2: Convert to fraction form
    153.26/211.76 = 121.84/x
  3. Step 3: Cross multiply
    153.26x = 211.76 × 121.84
  4. Step 4: Simplify right side
    153.26x = 25,800.84
  5. Step 5: Solve for x
    x = 25,800.84/153.26
  6. Step 6: Final answer
    x = 168.35

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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.