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Finding the Fourth Proportional to 93.42, 128.88 and 81.27

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Solution

The fourth proportional to 93.42, 128.88 and 81.27 is: 112.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.42 : 128.88 = 81.27 : x
  2. Step 2: Convert to fraction form
    93.42/128.88 = 81.27/x
  3. Step 3: Cross multiply
    93.42x = 128.88 × 81.27
  4. Step 4: Simplify right side
    93.42x = 10,474.08
  5. Step 5: Solve for x
    x = 10,474.08/93.42
  6. Step 6: Final answer
    x = 112.12

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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.