Home / 20,821.31-31,232.47-8,170.53

Finding the Fourth Proportional to 20,821.31, 31,232.47 and 8,170.53

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Solution

The fourth proportional to 20,821.31, 31,232.47 and 8,170.53 is: 12,255.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.31 : 31,232.47 = 8,170.53 : x
  2. Step 2: Convert to fraction form
    20,821.31/31,232.47 = 8,170.53/x
  3. Step 3: Cross multiply
    20,821.31x = 31,232.47 × 8,170.53
  4. Step 4: Simplify right side
    20,821.31x = 255,185,676.95
  5. Step 5: Solve for x
    x = 255,185,676.95/20,821.31
  6. Step 6: Final answer
    x = 12,255.99

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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.