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Finding the Fourth Proportional to 93.29, 128.39 and 77.79

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Solution

The fourth proportional to 93.29, 128.39 and 77.79 is: 107.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.29 : 128.39 = 77.79 : x
  2. Step 2: Convert to fraction form
    93.29/128.39 = 77.79/x
  3. Step 3: Cross multiply
    93.29x = 128.39 × 77.79
  4. Step 4: Simplify right side
    93.29x = 9,987.55
  5. Step 5: Solve for x
    x = 9,987.55/93.29
  6. Step 6: Final answer
    x = 107.06

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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.