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Finding the Fourth Proportional to 13,689.88, 18,892.38 and 8,387.62

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Solution

The fourth proportional to 13,689.88, 18,892.38 and 8,387.62 is: 11,575.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.88 : 18,892.38 = 8,387.62 : x
  2. Step 2: Convert to fraction form
    13,689.88/18,892.38 = 8,387.62/x
  3. Step 3: Cross multiply
    13,689.88x = 18,892.38 × 8,387.62
  4. Step 4: Simplify right side
    13,689.88x = 158,462,104.34
  5. Step 5: Solve for x
    x = 158,462,104.34/13,689.88
  6. Step 6: Final answer
    x = 11,575.13

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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.