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Finding the Fourth Proportional to 18,689.70, 25,791.41 and 10,306.20

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Solution

The fourth proportional to 18,689.70, 25,791.41 and 10,306.20 is: 14,222.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.70 : 25,791.41 = 10,306.20 : x
  2. Step 2: Convert to fraction form
    18,689.70/25,791.41 = 10,306.20/x
  3. Step 3: Cross multiply
    18,689.70x = 25,791.41 × 10,306.20
  4. Step 4: Simplify right side
    18,689.70x = 265,811,429.74
  5. Step 5: Solve for x
    x = 265,811,429.74/18,689.70
  6. Step 6: Final answer
    x = 14,222.35

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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.