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Finding the Fourth Proportional to 160.88, 221.81 and 128.07

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Solution

The fourth proportional to 160.88, 221.81 and 128.07 is: 176.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.88 : 221.81 = 128.07 : x
  2. Step 2: Convert to fraction form
    160.88/221.81 = 128.07/x
  3. Step 3: Cross multiply
    160.88x = 221.81 × 128.07
  4. Step 4: Simplify right side
    160.88x = 28,406.57
  5. Step 5: Solve for x
    x = 28,406.57/160.88
  6. Step 6: Final answer
    x = 176.58

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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.