Home / 20,821.80-31,230.78-6,970.92

Finding the Fourth Proportional to 20,821.80, 31,230.78 and 6,970.92

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Solution

The fourth proportional to 20,821.80, 31,230.78 and 6,970.92 is: 10,455.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.80 : 31,230.78 = 6,970.92 : x
  2. Step 2: Convert to fraction form
    20,821.80/31,230.78 = 6,970.92/x
  3. Step 3: Cross multiply
    20,821.80x = 31,230.78 × 6,970.92
  4. Step 4: Simplify right side
    20,821.80x = 217,707,268.92
  5. Step 5: Solve for x
    x = 217,707,268.92/20,821.80
  6. Step 6: Final answer
    x = 10,455.74

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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.