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Finding the Fourth Proportional to 12,939.18, 17,863.17 and 8,696.40

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Solution

The fourth proportional to 12,939.18, 17,863.17 and 8,696.40 is: 12,005.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.18 : 17,863.17 = 8,696.40 : x
  2. Step 2: Convert to fraction form
    12,939.18/17,863.17 = 8,696.40/x
  3. Step 3: Cross multiply
    12,939.18x = 17,863.17 × 8,696.40
  4. Step 4: Simplify right side
    12,939.18x = 155,345,271.59
  5. Step 5: Solve for x
    x = 155,345,271.59/12,939.18
  6. Step 6: Final answer
    x = 12,005.80

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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.