Home / 20,690.37-28,562.63-12,739.41

Finding the Fourth Proportional to 20,690.37, 28,562.63 and 12,739.41

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Solution

The fourth proportional to 20,690.37, 28,562.63 and 12,739.41 is: 17,586.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.37 : 28,562.63 = 12,739.41 : x
  2. Step 2: Convert to fraction form
    20,690.37/28,562.63 = 12,739.41/x
  3. Step 3: Cross multiply
    20,690.37x = 28,562.63 × 12,739.41
  4. Step 4: Simplify right side
    20,690.37x = 363,870,990.55
  5. Step 5: Solve for x
    x = 363,870,990.55/20,690.37
  6. Step 6: Final answer
    x = 17,586.49

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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.