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Finding the Fourth Proportional to 12,983.28, 17,909.28 and 8,263.68

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Solution

The fourth proportional to 12,983.28, 17,909.28 and 8,263.68 is: 11,399.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,983.28 : 17,909.28 = 8,263.68 : x
  2. Step 2: Convert to fraction form
    12,983.28/17,909.28 = 8,263.68/x
  3. Step 3: Cross multiply
    12,983.28x = 17,909.28 × 8,263.68
  4. Step 4: Simplify right side
    12,983.28x = 147,996,558.95
  5. Step 5: Solve for x
    x = 147,996,558.95/12,983.28
  6. Step 6: Final answer
    x = 11,399.01

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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.