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Finding the Fourth Proportional to 13,689.91, 18,859.31 and 13,022.87

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Solution

The fourth proportional to 13,689.91, 18,859.31 and 13,022.87 is: 17,940.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.91 : 18,859.31 = 13,022.87 : x
  2. Step 2: Convert to fraction form
    13,689.91/18,859.31 = 13,022.87/x
  3. Step 3: Cross multiply
    13,689.91x = 18,859.31 × 13,022.87
  4. Step 4: Simplify right side
    13,689.91x = 245,602,342.42
  5. Step 5: Solve for x
    x = 245,602,342.42/13,689.91
  6. Step 6: Final answer
    x = 17,940.40

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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.