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Finding the Fourth Proportional to 76.92, 114.61 and 76.60

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Solution

The fourth proportional to 76.92, 114.61 and 76.60 is: 114.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.92 : 114.61 = 76.60 : x
  2. Step 2: Convert to fraction form
    76.92/114.61 = 76.60/x
  3. Step 3: Cross multiply
    76.92x = 114.61 × 76.60
  4. Step 4: Simplify right side
    76.92x = 8,779.13
  5. Step 5: Solve for x
    x = 8,779.13/76.92
  6. Step 6: Final answer
    x = 114.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.