Home / 13,753.78-18,979.84-7,785.70

Finding the Fourth Proportional to 13,753.78, 18,979.84 and 7,785.70

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Solution

The fourth proportional to 13,753.78, 18,979.84 and 7,785.70 is: 10,744.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,753.78 : 18,979.84 = 7,785.70 : x
  2. Step 2: Convert to fraction form
    13,753.78/18,979.84 = 7,785.70/x
  3. Step 3: Cross multiply
    13,753.78x = 18,979.84 × 7,785.70
  4. Step 4: Simplify right side
    13,753.78x = 147,771,340.29
  5. Step 5: Solve for x
    x = 147,771,340.29/13,753.78
  6. Step 6: Final answer
    x = 10,744.05

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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.