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Finding the Fourth Proportional to 13,918.72, 20,859.90 and 12,159.49

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Solution

The fourth proportional to 13,918.72, 20,859.90 and 12,159.49 is: 18,223.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,918.72 : 20,859.90 = 12,159.49 : x
  2. Step 2: Convert to fraction form
    13,918.72/20,859.90 = 12,159.49/x
  3. Step 3: Cross multiply
    13,918.72x = 20,859.90 × 12,159.49
  4. Step 4: Simplify right side
    13,918.72x = 253,645,745.45
  5. Step 5: Solve for x
    x = 253,645,745.45/13,918.72
  6. Step 6: Final answer
    x = 18,223.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.