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Finding the Fourth Proportional to 93.54, 128.82 and 85.80

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Solution

The fourth proportional to 93.54, 128.82 and 85.80 is: 118.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.54 : 128.82 = 85.80 : x
  2. Step 2: Convert to fraction form
    93.54/128.82 = 85.80/x
  3. Step 3: Cross multiply
    93.54x = 128.82 × 85.80
  4. Step 4: Simplify right side
    93.54x = 11,052.76
  5. Step 5: Solve for x
    x = 11,052.76/93.54
  6. Step 6: Final answer
    x = 118.16

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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.