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Finding the Fourth Proportional to 8,640.28, 11,921.94 and 4,863.64

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Solution

The fourth proportional to 8,640.28, 11,921.94 and 4,863.64 is: 6,710.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.28 : 11,921.94 = 4,863.64 : x
  2. Step 2: Convert to fraction form
    8,640.28/11,921.94 = 4,863.64/x
  3. Step 3: Cross multiply
    8,640.28x = 11,921.94 × 4,863.64
  4. Step 4: Simplify right side
    8,640.28x = 57,984,024.26
  5. Step 5: Solve for x
    x = 57,984,024.26/8,640.28
  6. Step 6: Final answer
    x = 6,710.90

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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.