Home / 20,339.63-28,078.88-12,790.11

Finding the Fourth Proportional to 20,339.63, 28,078.88 and 12,790.11

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Solution

The fourth proportional to 20,339.63, 28,078.88 and 12,790.11 is: 17,656.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,339.63 : 28,078.88 = 12,790.11 : x
  2. Step 2: Convert to fraction form
    20,339.63/28,078.88 = 12,790.11/x
  3. Step 3: Cross multiply
    20,339.63x = 28,078.88 × 12,790.11
  4. Step 4: Simplify right side
    20,339.63x = 359,131,963.88
  5. Step 5: Solve for x
    x = 359,131,963.88/20,339.63
  6. Step 6: Final answer
    x = 17,656.76

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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.