Home / 20,853.12-28,777.20-11,421.72

Finding the Fourth Proportional to 20,853.12, 28,777.20 and 11,421.72

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Solution

The fourth proportional to 20,853.12, 28,777.20 and 11,421.72 is: 15,761.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.12 : 28,777.20 = 11,421.72 : x
  2. Step 2: Convert to fraction form
    20,853.12/28,777.20 = 11,421.72/x
  3. Step 3: Cross multiply
    20,853.12x = 28,777.20 × 11,421.72
  4. Step 4: Simplify right side
    20,853.12x = 328,685,120.78
  5. Step 5: Solve for x
    x = 328,685,120.78/20,853.12
  6. Step 6: Final answer
    x = 15,761.92

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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.