Home / 20,739.72-28,612.60-12,768.08

Finding the Fourth Proportional to 20,739.72, 28,612.60 and 12,768.08

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Solution

The fourth proportional to 20,739.72, 28,612.60 and 12,768.08 is: 17,614.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.72 : 28,612.60 = 12,768.08 : x
  2. Step 2: Convert to fraction form
    20,739.72/28,612.60 = 12,768.08/x
  3. Step 3: Cross multiply
    20,739.72x = 28,612.60 × 12,768.08
  4. Step 4: Simplify right side
    20,739.72x = 365,327,965.81
  5. Step 5: Solve for x
    x = 365,327,965.81/20,739.72
  6. Step 6: Final answer
    x = 17,614.89

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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.