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Finding the Fourth Proportional to 13,720.77, 18,920.52 and 11,737.89

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Solution

The fourth proportional to 13,720.77, 18,920.52 and 11,737.89 is: 16,186.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.77 : 18,920.52 = 11,737.89 : x
  2. Step 2: Convert to fraction form
    13,720.77/18,920.52 = 11,737.89/x
  3. Step 3: Cross multiply
    13,720.77x = 18,920.52 × 11,737.89
  4. Step 4: Simplify right side
    13,720.77x = 222,086,982.50
  5. Step 5: Solve for x
    x = 222,086,982.50/13,720.77
  6. Step 6: Final answer
    x = 16,186.19

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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.