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Finding the Fourth Proportional to 160.90, 221.78 and 139.84

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Solution

The fourth proportional to 160.90, 221.78 and 139.84 is: 192.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.90 : 221.78 = 139.84 : x
  2. Step 2: Convert to fraction form
    160.90/221.78 = 139.84/x
  3. Step 3: Cross multiply
    160.90x = 221.78 × 139.84
  4. Step 4: Simplify right side
    160.90x = 31,013.72
  5. Step 5: Solve for x
    x = 31,013.72/160.90
  6. Step 6: Final answer
    x = 192.75

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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.