Home / 21,020.20-31,530.22-6,981.30

Finding the Fourth Proportional to 21,020.20, 31,530.22 and 6,981.30

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Solution

The fourth proportional to 21,020.20, 31,530.22 and 6,981.30 is: 10,471.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,020.20 : 31,530.22 = 6,981.30 : x
  2. Step 2: Convert to fraction form
    21,020.20/31,530.22 = 6,981.30/x
  3. Step 3: Cross multiply
    21,020.20x = 31,530.22 × 6,981.30
  4. Step 4: Simplify right side
    21,020.20x = 220,121,907.43
  5. Step 5: Solve for x
    x = 220,121,907.43/21,020.20
  6. Step 6: Final answer
    x = 10,471.92

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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.