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Finding the Fourth Proportional to 2,139.44, 3,209.79 and 678.56

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Solution

The fourth proportional to 2,139.44, 3,209.79 and 678.56 is: 1,018.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.44 : 3,209.79 = 678.56 : x
  2. Step 2: Convert to fraction form
    2,139.44/3,209.79 = 678.56/x
  3. Step 3: Cross multiply
    2,139.44x = 3,209.79 × 678.56
  4. Step 4: Simplify right side
    2,139.44x = 2,178,035.10
  5. Step 5: Solve for x
    x = 2,178,035.10/2,139.44
  6. Step 6: Final answer
    x = 1,018.04

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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.