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Finding the Fourth Proportional to 13,694.91, 18,898.92 and 8,315.49

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Solution

The fourth proportional to 13,694.91, 18,898.92 and 8,315.49 is: 11,475.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,694.91 : 18,898.92 = 8,315.49 : x
  2. Step 2: Convert to fraction form
    13,694.91/18,898.92 = 8,315.49/x
  3. Step 3: Cross multiply
    13,694.91x = 18,898.92 × 8,315.49
  4. Step 4: Simplify right side
    13,694.91x = 157,153,780.27
  5. Step 5: Solve for x
    x = 157,153,780.27/13,694.91
  6. Step 6: Final answer
    x = 11,475.34

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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.