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Finding the Fourth Proportional to 93.11, 128.43 and 75.63

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Solution

The fourth proportional to 93.11, 128.43 and 75.63 is: 104.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.11 : 128.43 = 75.63 : x
  2. Step 2: Convert to fraction form
    93.11/128.43 = 75.63/x
  3. Step 3: Cross multiply
    93.11x = 128.43 × 75.63
  4. Step 4: Simplify right side
    93.11x = 9,712.14
  5. Step 5: Solve for x
    x = 9,712.14/93.11
  6. Step 6: Final answer
    x = 104.31

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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.