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Finding the Fourth Proportional to 93.60, 128.96 and 71.72

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Solution

The fourth proportional to 93.60, 128.96 and 71.72 is: 98.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.60 : 128.96 = 71.72 : x
  2. Step 2: Convert to fraction form
    93.60/128.96 = 71.72/x
  3. Step 3: Cross multiply
    93.60x = 128.96 × 71.72
  4. Step 4: Simplify right side
    93.60x = 9,249.01
  5. Step 5: Solve for x
    x = 9,249.01/93.60
  6. Step 6: Final answer
    x = 98.81

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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.