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Finding the Fourth Proportional to 93.96, 129.24 and 79.20

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Solution

The fourth proportional to 93.96, 129.24 and 79.20 is: 108.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.96 : 129.24 = 79.20 : x
  2. Step 2: Convert to fraction form
    93.96/129.24 = 79.20/x
  3. Step 3: Cross multiply
    93.96x = 129.24 × 79.20
  4. Step 4: Simplify right side
    93.96x = 10,235.81
  5. Step 5: Solve for x
    x = 10,235.81/93.96
  6. Step 6: Final answer
    x = 108.94

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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.