Home / 20,685.60-28,558.80-12,738.59

Finding the Fourth Proportional to 20,685.60, 28,558.80 and 12,738.59

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Solution

The fourth proportional to 20,685.60, 28,558.80 and 12,738.59 is: 17,587.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.60 : 28,558.80 = 12,738.59 : x
  2. Step 2: Convert to fraction form
    20,685.60/28,558.80 = 12,738.59/x
  3. Step 3: Cross multiply
    20,685.60x = 28,558.80 × 12,738.59
  4. Step 4: Simplify right side
    20,685.60x = 363,798,924.54
  5. Step 5: Solve for x
    x = 363,798,924.54/20,685.60
  6. Step 6: Final answer
    x = 17,587.06

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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.