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Finding the Fourth Proportional to 7,155.76, 10,734 and 1,961.68

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Solution

The fourth proportional to 7,155.76, 10,734 and 1,961.68 is: 2,942.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,155.76 : 10,734 = 1,961.68 : x
  2. Step 2: Convert to fraction form
    7,155.76/10,734 = 1,961.68/x
  3. Step 3: Cross multiply
    7,155.76x = 10,734 × 1,961.68
  4. Step 4: Simplify right side
    7,155.76x = 21,056,673.12
  5. Step 5: Solve for x
    x = 21,056,673.12/7,155.76
  6. Step 6: Final answer
    x = 2,942.62

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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.