Home / 20,643.21-28,488.31-12,143.81

Finding the Fourth Proportional to 20,643.21, 28,488.31 and 12,143.81

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Solution

The fourth proportional to 20,643.21, 28,488.31 and 12,143.81 is: 16,758.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.21 : 28,488.31 = 12,143.81 : x
  2. Step 2: Convert to fraction form
    20,643.21/28,488.31 = 12,143.81/x
  3. Step 3: Cross multiply
    20,643.21x = 28,488.31 × 12,143.81
  4. Step 4: Simplify right side
    20,643.21x = 345,956,664.72
  5. Step 5: Solve for x
    x = 345,956,664.72/20,643.21
  6. Step 6: Final answer
    x = 16,758.86

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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.