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Finding the Fourth Proportional to 8,664, 11,959.98 and 5,520.40

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Solution

The fourth proportional to 8,664, 11,959.98 and 5,520.40 is: 7,620.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,664 : 11,959.98 = 5,520.40 : x
  2. Step 2: Convert to fraction form
    8,664/11,959.98 = 5,520.40/x
  3. Step 3: Cross multiply
    8,664x = 11,959.98 × 5,520.40
  4. Step 4: Simplify right side
    8,664x = 66,023,873.59
  5. Step 5: Solve for x
    x = 66,023,873.59/8,664
  6. Step 6: Final answer
    x = 7,620.48

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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.