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Finding the Fourth Proportional to 13,691.28, 18,894 and 7,722.72

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Solution

The fourth proportional to 13,691.28, 18,894 and 7,722.72 is: 10,657.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,691.28 : 18,894 = 7,722.72 : x
  2. Step 2: Convert to fraction form
    13,691.28/18,894 = 7,722.72/x
  3. Step 3: Cross multiply
    13,691.28x = 18,894 × 7,722.72
  4. Step 4: Simplify right side
    13,691.28x = 145,913,071.68
  5. Step 5: Solve for x
    x = 145,913,071.68/13,691.28
  6. Step 6: Final answer
    x = 10,657.37

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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.