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Finding the Fourth Proportional to 93.15, 139.83 and 79.68

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Solution

The fourth proportional to 93.15, 139.83 and 79.68 is: 119.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.15 : 139.83 = 79.68 : x
  2. Step 2: Convert to fraction form
    93.15/139.83 = 79.68/x
  3. Step 3: Cross multiply
    93.15x = 139.83 × 79.68
  4. Step 4: Simplify right side
    93.15x = 11,141.88
  5. Step 5: Solve for x
    x = 11,141.88/93.15
  6. Step 6: Final answer
    x = 119.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.