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Finding the Fourth Proportional to 12,411.52, 17,125.92 and 7,939.20

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Solution

The fourth proportional to 12,411.52, 17,125.92 and 7,939.20 is: 10,954.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,411.52 : 17,125.92 = 7,939.20 : x
  2. Step 2: Convert to fraction form
    12,411.52/17,125.92 = 7,939.20/x
  3. Step 3: Cross multiply
    12,411.52x = 17,125.92 × 7,939.20
  4. Step 4: Simplify right side
    12,411.52x = 135,966,104.06
  5. Step 5: Solve for x
    x = 135,966,104.06/12,411.52
  6. Step 6: Final answer
    x = 10,954.83

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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.