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Finding the Fourth Proportional to 13,689.96, 18,892.28 and 7,721.04

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Solution

The fourth proportional to 13,689.96, 18,892.28 and 7,721.04 is: 10,655.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.96 : 18,892.28 = 7,721.04 : x
  2. Step 2: Convert to fraction form
    13,689.96/18,892.28 = 7,721.04/x
  3. Step 3: Cross multiply
    13,689.96x = 18,892.28 × 7,721.04
  4. Step 4: Simplify right side
    13,689.96x = 145,868,049.57
  5. Step 5: Solve for x
    x = 145,868,049.57/13,689.96
  6. Step 6: Final answer
    x = 10,655.11

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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.