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Finding the Fourth Proportional to 93.96, 129.84 and 74.76

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Solution

The fourth proportional to 93.96, 129.84 and 74.76 is: 103.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.96 : 129.84 = 74.76 : x
  2. Step 2: Convert to fraction form
    93.96/129.84 = 74.76/x
  3. Step 3: Cross multiply
    93.96x = 129.84 × 74.76
  4. Step 4: Simplify right side
    93.96x = 9,706.84
  5. Step 5: Solve for x
    x = 9,706.84/93.96
  6. Step 6: Final answer
    x = 103.31

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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.