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Finding the Fourth Proportional to 160.64, 221.55 and 121.39

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Solution

The fourth proportional to 160.64, 221.55 and 121.39 is: 167.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.64 : 221.55 = 121.39 : x
  2. Step 2: Convert to fraction form
    160.64/221.55 = 121.39/x
  3. Step 3: Cross multiply
    160.64x = 221.55 × 121.39
  4. Step 4: Simplify right side
    160.64x = 26,893.95
  5. Step 5: Solve for x
    x = 26,893.95/160.64
  6. Step 6: Final answer
    x = 167.42

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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.