Home / 20,818.21-28,726.56-13,261.44

Finding the Fourth Proportional to 20,818.21, 28,726.56 and 13,261.44

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Solution

The fourth proportional to 20,818.21, 28,726.56 and 13,261.44 is: 18,299.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.21 : 28,726.56 = 13,261.44 : x
  2. Step 2: Convert to fraction form
    20,818.21/28,726.56 = 13,261.44/x
  3. Step 3: Cross multiply
    20,818.21x = 28,726.56 × 13,261.44
  4. Step 4: Simplify right side
    20,818.21x = 380,955,551.85
  5. Step 5: Solve for x
    x = 380,955,551.85/20,818.21
  6. Step 6: Final answer
    x = 18,299.15

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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.