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Finding the Fourth Proportional to 12,979.70, 19,411.95 and 10,906.10

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Solution

The fourth proportional to 12,979.70, 19,411.95 and 10,906.10 is: 16,310.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.70 : 19,411.95 = 10,906.10 : x
  2. Step 2: Convert to fraction form
    12,979.70/19,411.95 = 10,906.10/x
  3. Step 3: Cross multiply
    12,979.70x = 19,411.95 × 10,906.10
  4. Step 4: Simplify right side
    12,979.70x = 211,708,667.90
  5. Step 5: Solve for x
    x = 211,708,667.90/12,979.70
  6. Step 6: Final answer
    x = 16,310.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.