Home / 20,789.58-28,720.98-13,636.47

Finding the Fourth Proportional to 20,789.58, 28,720.98 and 13,636.47

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Solution

The fourth proportional to 20,789.58, 28,720.98 and 13,636.47 is: 18,838.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.58 : 28,720.98 = 13,636.47 : x
  2. Step 2: Convert to fraction form
    20,789.58/28,720.98 = 13,636.47/x
  3. Step 3: Cross multiply
    20,789.58x = 28,720.98 × 13,636.47
  4. Step 4: Simplify right side
    20,789.58x = 391,652,782.14
  5. Step 5: Solve for x
    x = 391,652,782.14/20,789.58
  6. Step 6: Final answer
    x = 18,838.90

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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.