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Finding the Fourth Proportional to 13,689.38, 18,892.00 and 7,720.91

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Solution

The fourth proportional to 13,689.38, 18,892.00 and 7,720.91 is: 10,655.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.38 : 18,892.00 = 7,720.91 : x
  2. Step 2: Convert to fraction form
    13,689.38/18,892.00 = 7,720.91/x
  3. Step 3: Cross multiply
    13,689.38x = 18,892.00 × 7,720.91
  4. Step 4: Simplify right side
    13,689.38x = 145,863,388.80
  5. Step 5: Solve for x
    x = 145,863,388.80/13,689.38
  6. Step 6: Final answer
    x = 10,655.23

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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.