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Finding the Fourth Proportional to 18,642.70, 25,730.61 and 10,690.30

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Solution

The fourth proportional to 18,642.70, 25,730.61 and 10,690.30 is: 14,754.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,642.70 : 25,730.61 = 10,690.30 : x
  2. Step 2: Convert to fraction form
    18,642.70/25,730.61 = 10,690.30/x
  3. Step 3: Cross multiply
    18,642.70x = 25,730.61 × 10,690.30
  4. Step 4: Simplify right side
    18,642.70x = 275,067,940.08
  5. Step 5: Solve for x
    x = 275,067,940.08/18,642.70
  6. Step 6: Final answer
    x = 14,754.73

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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.