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Finding the Fourth Proportional to 76.08, 104.40 and 68.64

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Solution

The fourth proportional to 76.08, 104.40 and 68.64 is: 94.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.08 : 104.40 = 68.64 : x
  2. Step 2: Convert to fraction form
    76.08/104.40 = 68.64/x
  3. Step 3: Cross multiply
    76.08x = 104.40 × 68.64
  4. Step 4: Simplify right side
    76.08x = 7,166.02
  5. Step 5: Solve for x
    x = 7,166.02/76.08
  6. Step 6: Final answer
    x = 94.19

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.