Home / 20,821.40-31,210.20-12,923.88

Finding the Fourth Proportional to 20,821.40, 31,210.20 and 12,923.88

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Solution

The fourth proportional to 20,821.40, 31,210.20 and 12,923.88 is: 19,372.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.40 : 31,210.20 = 12,923.88 : x
  2. Step 2: Convert to fraction form
    20,821.40/31,210.20 = 12,923.88/x
  3. Step 3: Cross multiply
    20,821.40x = 31,210.20 × 12,923.88
  4. Step 4: Simplify right side
    20,821.40x = 403,356,879.58
  5. Step 5: Solve for x
    x = 403,356,879.58/20,821.40
  6. Step 6: Final answer
    x = 19,372.23

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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.