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Finding the Fourth Proportional to 93.26, 128.82 and 71.70

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Solution

The fourth proportional to 93.26, 128.82 and 71.70 is: 99.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.26 : 128.82 = 71.70 : x
  2. Step 2: Convert to fraction form
    93.26/128.82 = 71.70/x
  3. Step 3: Cross multiply
    93.26x = 128.82 × 71.70
  4. Step 4: Simplify right side
    93.26x = 9,236.18
  5. Step 5: Solve for x
    x = 9,236.18/93.26
  6. Step 6: Final answer
    x = 99.03

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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.