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Finding the Fourth Proportional to 20,879.19, 31,323.64 and 7,028.19

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Solution

The fourth proportional to 20,879.19, 31,323.64 and 7,028.19 is: 10,543.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.19 : 31,323.64 = 7,028.19 : x
  2. Step 2: Convert to fraction form
    20,879.19/31,323.64 = 7,028.19/x
  3. Step 3: Cross multiply
    20,879.19x = 31,323.64 × 7,028.19
  4. Step 4: Simplify right side
    20,879.19x = 220,148,493.41
  5. Step 5: Solve for x
    x = 220,148,493.41/20,879.19
  6. Step 6: Final answer
    x = 10,543.92

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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.