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Finding the Fourth Proportional to 93.12, 128.80 and 85.92

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Solution

The fourth proportional to 93.12, 128.80 and 85.92 is: 118.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.12 : 128.80 = 85.92 : x
  2. Step 2: Convert to fraction form
    93.12/128.80 = 85.92/x
  3. Step 3: Cross multiply
    93.12x = 128.80 × 85.92
  4. Step 4: Simplify right side
    93.12x = 11,066.50
  5. Step 5: Solve for x
    x = 11,066.50/93.12
  6. Step 6: Final answer
    x = 118.84

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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.