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Finding the Fourth Proportional to 160.90, 221.89 and 98.71

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Solution

The fourth proportional to 160.90, 221.89 and 98.71 is: 136.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.90 : 221.89 = 98.71 : x
  2. Step 2: Convert to fraction form
    160.90/221.89 = 98.71/x
  3. Step 3: Cross multiply
    160.90x = 221.89 × 98.71
  4. Step 4: Simplify right side
    160.90x = 21,902.76
  5. Step 5: Solve for x
    x = 21,902.76/160.90
  6. Step 6: Final answer
    x = 136.13

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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.