Home / 20,820.75-31,234.40-8,977.89

Finding the Fourth Proportional to 20,820.75, 31,234.40 and 8,977.89

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Solution

The fourth proportional to 20,820.75, 31,234.40 and 8,977.89 is: 13,468.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.75 : 31,234.40 = 8,977.89 : x
  2. Step 2: Convert to fraction form
    20,820.75/31,234.40 = 8,977.89/x
  3. Step 3: Cross multiply
    20,820.75x = 31,234.40 × 8,977.89
  4. Step 4: Simplify right side
    20,820.75x = 280,418,962.53
  5. Step 5: Solve for x
    x = 280,418,962.53/20,820.75
  6. Step 6: Final answer
    x = 13,468.25

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1.5x scale

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.