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Finding the Fourth Proportional to 13,690.79, 18,893.28 and 7,722.44

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Solution

The fourth proportional to 13,690.79, 18,893.28 and 7,722.44 is: 10,656.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.79 : 18,893.28 = 7,722.44 : x
  2. Step 2: Convert to fraction form
    13,690.79/18,893.28 = 7,722.44/x
  3. Step 3: Cross multiply
    13,690.79x = 18,893.28 × 7,722.44
  4. Step 4: Simplify right side
    13,690.79x = 145,902,221.20
  5. Step 5: Solve for x
    x = 145,902,221.20/13,690.79
  6. Step 6: Final answer
    x = 10,656.96

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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.