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Finding the Fourth Proportional to 12,680.94, 17,505.80 and 8,439.08

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Solution

The fourth proportional to 12,680.94, 17,505.80 and 8,439.08 is: 11,649.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,680.94 : 17,505.80 = 8,439.08 : x
  2. Step 2: Convert to fraction form
    12,680.94/17,505.80 = 8,439.08/x
  3. Step 3: Cross multiply
    12,680.94x = 17,505.80 × 8,439.08
  4. Step 4: Simplify right side
    12,680.94x = 147,732,716.94
  5. Step 5: Solve for x
    x = 147,732,716.94/12,680.94
  6. Step 6: Final answer
    x = 11,649.98

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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.