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Finding the Fourth Proportional to 13,753.71, 18,979.55 and 7,785.71

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Solution

The fourth proportional to 13,753.71, 18,979.55 and 7,785.71 is: 10,743.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,753.71 : 18,979.55 = 7,785.71 : x
  2. Step 2: Convert to fraction form
    13,753.71/18,979.55 = 7,785.71/x
  3. Step 3: Cross multiply
    13,753.71x = 18,979.55 × 7,785.71
  4. Step 4: Simplify right side
    13,753.71x = 147,769,138.40
  5. Step 5: Solve for x
    x = 147,769,138.40/13,753.71
  6. Step 6: Final answer
    x = 10,743.95

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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.