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Finding the Fourth Proportional to 93.56, 128.97 and 72.81

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Solution

The fourth proportional to 93.56, 128.97 and 72.81 is: 100.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.56 : 128.97 = 72.81 : x
  2. Step 2: Convert to fraction form
    93.56/128.97 = 72.81/x
  3. Step 3: Cross multiply
    93.56x = 128.97 × 72.81
  4. Step 4: Simplify right side
    93.56x = 9,390.31
  5. Step 5: Solve for x
    x = 9,390.31/93.56
  6. Step 6: Final answer
    x = 100.37

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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.