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Finding the Fourth Proportional to 93.03, 128.27 and 86.88

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Solution

The fourth proportional to 93.03, 128.27 and 86.88 is: 119.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.03 : 128.27 = 86.88 : x
  2. Step 2: Convert to fraction form
    93.03/128.27 = 86.88/x
  3. Step 3: Cross multiply
    93.03x = 128.27 × 86.88
  4. Step 4: Simplify right side
    93.03x = 11,144.10
  5. Step 5: Solve for x
    x = 11,144.10/93.03
  6. Step 6: Final answer
    x = 119.79

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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.