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Finding the Fourth Proportional to 21,082.65, 31,620.39 and 7,041.09

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Solution

The fourth proportional to 21,082.65, 31,620.39 and 7,041.09 is: 10,560.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,082.65 : 31,620.39 = 7,041.09 : x
  2. Step 2: Convert to fraction form
    21,082.65/31,620.39 = 7,041.09/x
  3. Step 3: Cross multiply
    21,082.65x = 31,620.39 × 7,041.09
  4. Step 4: Simplify right side
    21,082.65x = 222,642,011.83
  5. Step 5: Solve for x
    x = 222,642,011.83/21,082.65
  6. Step 6: Final answer
    x = 10,560.44

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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.