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Finding the Fourth Proportional to 93.22, 128.60 and 63.68

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Solution

The fourth proportional to 93.22, 128.60 and 63.68 is: 87.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.22 : 128.60 = 63.68 : x
  2. Step 2: Convert to fraction form
    93.22/128.60 = 63.68/x
  3. Step 3: Cross multiply
    93.22x = 128.60 × 63.68
  4. Step 4: Simplify right side
    93.22x = 8,189.25
  5. Step 5: Solve for x
    x = 8,189.25/93.22
  6. Step 6: Final answer
    x = 87.85

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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.