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Finding the Fourth Proportional to 8,689.36, 11,991.36 and 4,913.20

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Solution

The fourth proportional to 8,689.36, 11,991.36 and 4,913.20 is: 6,780.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.36 : 11,991.36 = 4,913.20 : x
  2. Step 2: Convert to fraction form
    8,689.36/11,991.36 = 4,913.20/x
  3. Step 3: Cross multiply
    8,689.36x = 11,991.36 × 4,913.20
  4. Step 4: Simplify right side
    8,689.36x = 58,915,949.95
  5. Step 5: Solve for x
    x = 58,915,949.95/8,689.36
  6. Step 6: Final answer
    x = 6,780.24

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1.5x scale

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.