Home / 20,783.85-28,644.64-15,735.98

Finding the Fourth Proportional to 20,783.85, 28,644.64 and 15,735.98

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Solution

The fourth proportional to 20,783.85, 28,644.64 and 15,735.98 is: 21,687.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.85 : 28,644.64 = 15,735.98 : x
  2. Step 2: Convert to fraction form
    20,783.85/28,644.64 = 15,735.98/x
  3. Step 3: Cross multiply
    20,783.85x = 28,644.64 × 15,735.98
  4. Step 4: Simplify right side
    20,783.85x = 450,751,514.42
  5. Step 5: Solve for x
    x = 450,751,514.42/20,783.85
  6. Step 6: Final answer
    x = 21,687.59

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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.