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Finding the Fourth Proportional to 93.60, 128.61 and 85.50

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Solution

The fourth proportional to 93.60, 128.61 and 85.50 is: 117.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.60 : 128.61 = 85.50 : x
  2. Step 2: Convert to fraction form
    93.60/128.61 = 85.50/x
  3. Step 3: Cross multiply
    93.60x = 128.61 × 85.50
  4. Step 4: Simplify right side
    93.60x = 10,996.16
  5. Step 5: Solve for x
    x = 10,996.16/93.60
  6. Step 6: Final answer
    x = 117.48

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.