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Finding the Fourth Proportional to 18,805.65, 25,951.55 and 10,422.15

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Solution

The fourth proportional to 18,805.65, 25,951.55 and 10,422.15 is: 14,382.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.65 : 25,951.55 = 10,422.15 : x
  2. Step 2: Convert to fraction form
    18,805.65/25,951.55 = 10,422.15/x
  3. Step 3: Cross multiply
    18,805.65x = 25,951.55 × 10,422.15
  4. Step 4: Simplify right side
    18,805.65x = 270,470,894.72
  5. Step 5: Solve for x
    x = 270,470,894.72/18,805.65
  6. Step 6: Final answer
    x = 14,382.43

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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.