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Finding the Fourth Proportional to 93.38, 128.76 and 68.37

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Solution

The fourth proportional to 93.38, 128.76 and 68.37 is: 94.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.38 : 128.76 = 68.37 : x
  2. Step 2: Convert to fraction form
    93.38/128.76 = 68.37/x
  3. Step 3: Cross multiply
    93.38x = 128.76 × 68.37
  4. Step 4: Simplify right side
    93.38x = 8,802.58
  5. Step 5: Solve for x
    x = 8,802.58/93.38
  6. Step 6: Final answer
    x = 94.27

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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.