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Finding the Fourth Proportional to 18,689.88, 25,791.92 and 10,306.38

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Solution

The fourth proportional to 18,689.88, 25,791.92 and 10,306.38 is: 14,222.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.88 : 25,791.92 = 10,306.38 : x
  2. Step 2: Convert to fraction form
    18,689.88/25,791.92 = 10,306.38/x
  3. Step 3: Cross multiply
    18,689.88x = 25,791.92 × 10,306.38
  4. Step 4: Simplify right side
    18,689.88x = 265,821,276.92
  5. Step 5: Solve for x
    x = 265,821,276.92/18,689.88
  6. Step 6: Final answer
    x = 14,222.74

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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.