Home / 20,690.58-28,558.38-13,140.54

Finding the Fourth Proportional to 20,690.58, 28,558.38 and 13,140.54

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Solution

The fourth proportional to 20,690.58, 28,558.38 and 13,140.54 is: 18,137.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.58 : 28,558.38 = 13,140.54 : x
  2. Step 2: Convert to fraction form
    20,690.58/28,558.38 = 13,140.54/x
  3. Step 3: Cross multiply
    20,690.58x = 28,558.38 × 13,140.54
  4. Step 4: Simplify right side
    20,690.58x = 375,272,534.73
  5. Step 5: Solve for x
    x = 375,272,534.73/20,690.58
  6. Step 6: Final answer
    x = 18,137.36

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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.