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Finding the Fourth Proportional to 93.06, 128.28 and 66.78

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Solution

The fourth proportional to 93.06, 128.28 and 66.78 is: 92.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.06 : 128.28 = 66.78 : x
  2. Step 2: Convert to fraction form
    93.06/128.28 = 66.78/x
  3. Step 3: Cross multiply
    93.06x = 128.28 × 66.78
  4. Step 4: Simplify right side
    93.06x = 8,566.54
  5. Step 5: Solve for x
    x = 8,566.54/93.06
  6. Step 6: Final answer
    x = 92.05

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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.