Home / 20,372.61-28,113.67-11,420.70

Finding the Fourth Proportional to 20,372.61, 28,113.67 and 11,420.70

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Solution

The fourth proportional to 20,372.61, 28,113.67 and 11,420.70 is: 15,760.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,372.61 : 28,113.67 = 11,420.70 : x
  2. Step 2: Convert to fraction form
    20,372.61/28,113.67 = 11,420.70/x
  3. Step 3: Cross multiply
    20,372.61x = 28,113.67 × 11,420.70
  4. Step 4: Simplify right side
    20,372.61x = 321,077,790.97
  5. Step 5: Solve for x
    x = 321,077,790.97/20,372.61
  6. Step 6: Final answer
    x = 15,760.27

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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.