Home / 20,338.63-28,077.50-12,789.11

Finding the Fourth Proportional to 20,338.63, 28,077.50 and 12,789.11

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Solution

The fourth proportional to 20,338.63, 28,077.50 and 12,789.11 is: 17,655.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,338.63 : 28,077.50 = 12,789.11 : x
  2. Step 2: Convert to fraction form
    20,338.63/28,077.50 = 12,789.11/x
  3. Step 3: Cross multiply
    20,338.63x = 28,077.50 × 12,789.11
  4. Step 4: Simplify right side
    20,338.63x = 359,086,338.19
  5. Step 5: Solve for x
    x = 359,086,338.19/20,338.63
  6. Step 6: Final answer
    x = 17,655.39

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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.