Home / 20,790.22-28,720.86-17,990.86

Finding the Fourth Proportional to 20,790.22, 28,720.86 and 17,990.86

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Solution

The fourth proportional to 20,790.22, 28,720.86 and 17,990.86 is: 24,853.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.22 : 28,720.86 = 17,990.86 : x
  2. Step 2: Convert to fraction form
    20,790.22/28,720.86 = 17,990.86/x
  3. Step 3: Cross multiply
    20,790.22x = 28,720.86 × 17,990.86
  4. Step 4: Simplify right side
    20,790.22x = 516,712,971.34
  5. Step 5: Solve for x
    x = 516,712,971.34/20,790.22
  6. Step 6: Final answer
    x = 24,853.66

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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.