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Finding the Fourth Proportional to 8,640.90, 12,953.12 and 3,958.89

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Solution

The fourth proportional to 8,640.90, 12,953.12 and 3,958.89 is: 5,934.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.90 : 12,953.12 = 3,958.89 : x
  2. Step 2: Convert to fraction form
    8,640.90/12,953.12 = 3,958.89/x
  3. Step 3: Cross multiply
    8,640.90x = 12,953.12 × 3,958.89
  4. Step 4: Simplify right side
    8,640.90x = 51,279,957.44
  5. Step 5: Solve for x
    x = 51,279,957.44/8,640.90
  6. Step 6: Final answer
    x = 5,934.56

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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.