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Finding the Fourth Proportional to 128.22, 176.90 and 93.32

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Solution

The fourth proportional to 128.22, 176.90 and 93.32 is: 128.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.22 : 176.90 = 93.32 : x
  2. Step 2: Convert to fraction form
    128.22/176.90 = 93.32/x
  3. Step 3: Cross multiply
    128.22x = 176.90 × 93.32
  4. Step 4: Simplify right side
    128.22x = 16,508.15
  5. Step 5: Solve for x
    x = 16,508.15/128.22
  6. Step 6: Final answer
    x = 128.75

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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.