Home / 28,157.21-42,290.49-20,732.35

Finding the Fourth Proportional to 28,157.21, 42,290.49 and 20,732.35

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Solution

The fourth proportional to 28,157.21, 42,290.49 and 20,732.35 is: 31,138.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,157.21 : 42,290.49 = 20,732.35 : x
  2. Step 2: Convert to fraction form
    28,157.21/42,290.49 = 20,732.35/x
  3. Step 3: Cross multiply
    28,157.21x = 42,290.49 × 20,732.35
  4. Step 4: Simplify right side
    28,157.21x = 876,781,240.35
  5. Step 5: Solve for x
    x = 876,781,240.35/28,157.21
  6. Step 6: Final answer
    x = 31,138.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.