Home / 20,372.40-28,113.26-11,420.42

Finding the Fourth Proportional to 20,372.40, 28,113.26 and 11,420.42

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Solution

The fourth proportional to 20,372.40, 28,113.26 and 11,420.42 is: 15,759.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,372.40 : 28,113.26 = 11,420.42 : x
  2. Step 2: Convert to fraction form
    20,372.40/28,113.26 = 11,420.42/x
  3. Step 3: Cross multiply
    20,372.40x = 28,113.26 × 11,420.42
  4. Step 4: Simplify right side
    20,372.40x = 321,065,039.10
  5. Step 5: Solve for x
    x = 321,065,039.10/20,372.40
  6. Step 6: Final answer
    x = 15,759.80

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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.