Home / 20,427.21-28,181.39-12,871.53

Finding the Fourth Proportional to 20,427.21, 28,181.39 and 12,871.53

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Solution

The fourth proportional to 20,427.21, 28,181.39 and 12,871.53 is: 17,757.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,427.21 : 28,181.39 = 12,871.53 : x
  2. Step 2: Convert to fraction form
    20,427.21/28,181.39 = 12,871.53/x
  3. Step 3: Cross multiply
    20,427.21x = 28,181.39 × 12,871.53
  4. Step 4: Simplify right side
    20,427.21x = 362,737,542.47
  5. Step 5: Solve for x
    x = 362,737,542.47/20,427.21
  6. Step 6: Final answer
    x = 17,757.57

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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.