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Finding the Fourth Proportional to 12,939.75, 17,859.02 and 7,635.87

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Solution

The fourth proportional to 12,939.75, 17,859.02 and 7,635.87 is: 10,538.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.75 : 17,859.02 = 7,635.87 : x
  2. Step 2: Convert to fraction form
    12,939.75/17,859.02 = 7,635.87/x
  3. Step 3: Cross multiply
    12,939.75x = 17,859.02 × 7,635.87
  4. Step 4: Simplify right side
    12,939.75x = 136,369,116.87
  5. Step 5: Solve for x
    x = 136,369,116.87/12,939.75
  6. Step 6: Final answer
    x = 10,538.78

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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.