Home / 30,821.40-46,232.10-20,979.90

Finding the Fourth Proportional to 30,821.40, 46,232.10 and 20,979.90

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Solution

The fourth proportional to 30,821.40, 46,232.10 and 20,979.90 is: 31,469.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,821.40 : 46,232.10 = 20,979.90 : x
  2. Step 2: Convert to fraction form
    30,821.40/46,232.10 = 20,979.90/x
  3. Step 3: Cross multiply
    30,821.40x = 46,232.10 × 20,979.90
  4. Step 4: Simplify right side
    30,821.40x = 969,944,834.79
  5. Step 5: Solve for x
    x = 969,944,834.79/30,821.40
  6. Step 6: Final answer
    x = 31,469.85

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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.