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Finding the Fourth Proportional to 21,216.20, 31,814.70 and 8,064.20

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Solution

The fourth proportional to 21,216.20, 31,814.70 and 8,064.20 is: 12,092.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,216.20 : 31,814.70 = 8,064.20 : x
  2. Step 2: Convert to fraction form
    21,216.20/31,814.70 = 8,064.20/x
  3. Step 3: Cross multiply
    21,216.20x = 31,814.70 × 8,064.20
  4. Step 4: Simplify right side
    21,216.20x = 256,560,103.74
  5. Step 5: Solve for x
    x = 256,560,103.74/21,216.20
  6. Step 6: Final answer
    x = 12,092.65

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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.