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Finding the Fourth Proportional to 160.02, 220.78 and 128.90

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Solution

The fourth proportional to 160.02, 220.78 and 128.90 is: 177.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.02 : 220.78 = 128.90 : x
  2. Step 2: Convert to fraction form
    160.02/220.78 = 128.90/x
  3. Step 3: Cross multiply
    160.02x = 220.78 × 128.90
  4. Step 4: Simplify right side
    160.02x = 28,458.54
  5. Step 5: Solve for x
    x = 28,458.54/160.02
  6. Step 6: Final answer
    x = 177.84

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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.