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Finding the Fourth Proportional to 13,689.68, 20,435.50 and 12,028.92

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Solution

The fourth proportional to 13,689.68, 20,435.50 and 12,028.92 is: 17,956.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.68 : 20,435.50 = 12,028.92 : x
  2. Step 2: Convert to fraction form
    13,689.68/20,435.50 = 12,028.92/x
  3. Step 3: Cross multiply
    13,689.68x = 20,435.50 × 12,028.92
  4. Step 4: Simplify right side
    13,689.68x = 245,816,994.66
  5. Step 5: Solve for x
    x = 245,816,994.66/13,689.68
  6. Step 6: Final answer
    x = 17,956.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.