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Finding the Fourth Proportional to 13,615.82, 18,789.13 and 9,138.95

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Solution

The fourth proportional to 13,615.82, 18,789.13 and 9,138.95 is: 12,611.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.82 : 18,789.13 = 9,138.95 : x
  2. Step 2: Convert to fraction form
    13,615.82/18,789.13 = 9,138.95/x
  3. Step 3: Cross multiply
    13,615.82x = 18,789.13 × 9,138.95
  4. Step 4: Simplify right side
    13,615.82x = 171,712,919.61
  5. Step 5: Solve for x
    x = 171,712,919.61/13,615.82
  6. Step 6: Final answer
    x = 12,611.28

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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.