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Finding the Fourth Proportional to 12,690.50, 17,520.57 and 8,282.18

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Solution

The fourth proportional to 12,690.50, 17,520.57 and 8,282.18 is: 11,434.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.50 : 17,520.57 = 8,282.18 : x
  2. Step 2: Convert to fraction form
    12,690.50/17,520.57 = 8,282.18/x
  3. Step 3: Cross multiply
    12,690.50x = 17,520.57 × 8,282.18
  4. Step 4: Simplify right side
    12,690.50x = 145,108,514.44
  5. Step 5: Solve for x
    x = 145,108,514.44/12,690.50
  6. Step 6: Final answer
    x = 11,434.42

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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.