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Finding the Fourth Proportional to 13,689.23, 18,890.46 and 7,720.88

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Solution

The fourth proportional to 13,689.23, 18,890.46 and 7,720.88 is: 10,654.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.23 : 18,890.46 = 7,720.88 : x
  2. Step 2: Convert to fraction form
    13,689.23/18,890.46 = 7,720.88/x
  3. Step 3: Cross multiply
    13,689.23x = 18,890.46 × 7,720.88
  4. Step 4: Simplify right side
    13,689.23x = 145,850,880.35
  5. Step 5: Solve for x
    x = 145,850,880.35/13,689.23
  6. Step 6: Final answer
    x = 10,654.43

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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.