Home / 20,291.72-30,431.82-6,440.36

Finding the Fourth Proportional to 20,291.72, 30,431.82 and 6,440.36

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Solution

The fourth proportional to 20,291.72, 30,431.82 and 6,440.36 is: 9,658.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,291.72 : 30,431.82 = 6,440.36 : x
  2. Step 2: Convert to fraction form
    20,291.72/30,431.82 = 6,440.36/x
  3. Step 3: Cross multiply
    20,291.72x = 30,431.82 × 6,440.36
  4. Step 4: Simplify right side
    20,291.72x = 195,991,876.26
  5. Step 5: Solve for x
    x = 195,991,876.26/20,291.72
  6. Step 6: Final answer
    x = 9,658.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.