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Finding the Fourth Proportional to 13,489.90, 18,616.07 and 7,521.44

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Solution

The fourth proportional to 13,489.90, 18,616.07 and 7,521.44 is: 10,379.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,489.90 : 18,616.07 = 7,521.44 : x
  2. Step 2: Convert to fraction form
    13,489.90/18,616.07 = 7,521.44/x
  3. Step 3: Cross multiply
    13,489.90x = 18,616.07 × 7,521.44
  4. Step 4: Simplify right side
    13,489.90x = 140,019,579.26
  5. Step 5: Solve for x
    x = 140,019,579.26/13,489.90
  6. Step 6: Final answer
    x = 10,379.59

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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.