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Finding the Fourth Proportional to 93.26, 128.58 and 71.39

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Solution

The fourth proportional to 93.26, 128.58 and 71.39 is: 98.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.26 : 128.58 = 71.39 : x
  2. Step 2: Convert to fraction form
    93.26/128.58 = 71.39/x
  3. Step 3: Cross multiply
    93.26x = 128.58 × 71.39
  4. Step 4: Simplify right side
    93.26x = 9,179.33
  5. Step 5: Solve for x
    x = 9,179.33/93.26
  6. Step 6: Final answer
    x = 98.43

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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.