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Finding the Fourth Proportional to 12,305.28, 16,972.52 and 8,215.02

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Solution

The fourth proportional to 12,305.28, 16,972.52 and 8,215.02 is: 11,330.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,305.28 : 16,972.52 = 8,215.02 : x
  2. Step 2: Convert to fraction form
    12,305.28/16,972.52 = 8,215.02/x
  3. Step 3: Cross multiply
    12,305.28x = 16,972.52 × 8,215.02
  4. Step 4: Simplify right side
    12,305.28x = 139,429,591.25
  5. Step 5: Solve for x
    x = 139,429,591.25/12,305.28
  6. Step 6: Final answer
    x = 11,330.88

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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.