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Finding the Fourth Proportional to 2,081.80, 3,123.11 and 620.92

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Solution

The fourth proportional to 2,081.80, 3,123.11 and 620.92 is: 931.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,081.80 : 3,123.11 = 620.92 : x
  2. Step 2: Convert to fraction form
    2,081.80/3,123.11 = 620.92/x
  3. Step 3: Cross multiply
    2,081.80x = 3,123.11 × 620.92
  4. Step 4: Simplify right side
    2,081.80x = 1,939,201.46
  5. Step 5: Solve for x
    x = 1,939,201.46/2,081.80
  6. Step 6: Final answer
    x = 931.50

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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.