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Finding the Fourth Proportional to 8,426.72, 12,640.09 and 2,880.12

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Solution

The fourth proportional to 8,426.72, 12,640.09 and 2,880.12 is: 4,320.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,426.72 : 12,640.09 = 2,880.12 : x
  2. Step 2: Convert to fraction form
    8,426.72/12,640.09 = 2,880.12/x
  3. Step 3: Cross multiply
    8,426.72x = 12,640.09 × 2,880.12
  4. Step 4: Simplify right side
    8,426.72x = 36,404,968.81
  5. Step 5: Solve for x
    x = 36,404,968.81/8,426.72
  6. Step 6: Final answer
    x = 4,320.18

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1.5x scale

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.