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Finding the Fourth Proportional to 13,690.61, 18,895.77 and 7,722.39

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Solution

The fourth proportional to 13,690.61, 18,895.77 and 7,722.39 is: 10,658.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.61 : 18,895.77 = 7,722.39 : x
  2. Step 2: Convert to fraction form
    13,690.61/18,895.77 = 7,722.39/x
  3. Step 3: Cross multiply
    13,690.61x = 18,895.77 × 7,722.39
  4. Step 4: Simplify right side
    13,690.61x = 145,920,505.29
  5. Step 5: Solve for x
    x = 145,920,505.29/13,690.61
  6. Step 6: Final answer
    x = 10,658.44

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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.