Home / 21,535.80-29,728.50-20,190.68

Finding the Fourth Proportional to 21,535.80, 29,728.50 and 20,190.68

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Solution

The fourth proportional to 21,535.80, 29,728.50 and 20,190.68 is: 27,871.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,535.80 : 29,728.50 = 20,190.68 : x
  2. Step 2: Convert to fraction form
    21,535.80/29,728.50 = 20,190.68/x
  3. Step 3: Cross multiply
    21,535.80x = 29,728.50 × 20,190.68
  4. Step 4: Simplify right side
    21,535.80x = 600,238,630.38
  5. Step 5: Solve for x
    x = 600,238,630.38/21,535.80
  6. Step 6: Final answer
    x = 27,871.67

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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.