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Finding the Fourth Proportional to 7,854.72, 11,784 and 2,660.64

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Solution

The fourth proportional to 7,854.72, 11,784 and 2,660.64 is: 3,991.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,854.72 : 11,784 = 2,660.64 : x
  2. Step 2: Convert to fraction form
    7,854.72/11,784 = 2,660.64/x
  3. Step 3: Cross multiply
    7,854.72x = 11,784 × 2,660.64
  4. Step 4: Simplify right side
    7,854.72x = 31,352,981.76
  5. Step 5: Solve for x
    x = 31,352,981.76/7,854.72
  6. Step 6: Final answer
    x = 3,991.61

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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.