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Finding the Fourth Proportional to 2,626.35, 3,939.39 and 678.57

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Solution

The fourth proportional to 2,626.35, 3,939.39 and 678.57 is: 1,017.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,626.35 : 3,939.39 = 678.57 : x
  2. Step 2: Convert to fraction form
    2,626.35/3,939.39 = 678.57/x
  3. Step 3: Cross multiply
    2,626.35x = 3,939.39 × 678.57
  4. Step 4: Simplify right side
    2,626.35x = 2,673,151.87
  5. Step 5: Solve for x
    x = 2,673,151.87/2,626.35
  6. Step 6: Final answer
    x = 1,017.82

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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.