Home / 20,372.78-28,114.40-11,420.28

Finding the Fourth Proportional to 20,372.78, 28,114.40 and 11,420.28

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Solution

The fourth proportional to 20,372.78, 28,114.40 and 11,420.28 is: 15,759.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,372.78 : 28,114.40 = 11,420.28 : x
  2. Step 2: Convert to fraction form
    20,372.78/28,114.40 = 11,420.28/x
  3. Step 3: Cross multiply
    20,372.78x = 28,114.40 × 11,420.28
  4. Step 4: Simplify right side
    20,372.78x = 321,074,320.03
  5. Step 5: Solve for x
    x = 321,074,320.03/20,372.78
  6. Step 6: Final answer
    x = 15,759.97

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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.