Home / 20,820.12-31,240.43-9,725.21

Finding the Fourth Proportional to 20,820.12, 31,240.43 and 9,725.21

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Solution

The fourth proportional to 20,820.12, 31,240.43 and 9,725.21 is: 14,592.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.12 : 31,240.43 = 9,725.21 : x
  2. Step 2: Convert to fraction form
    20,820.12/31,240.43 = 9,725.21/x
  3. Step 3: Cross multiply
    20,820.12x = 31,240.43 × 9,725.21
  4. Step 4: Simplify right side
    20,820.12x = 303,819,537.41
  5. Step 5: Solve for x
    x = 303,819,537.41/20,820.12
  6. Step 6: Final answer
    x = 14,592.59

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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.