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Finding the Fourth Proportional to 2,626.20, 3,939.28 and 678.40

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Solution

The fourth proportional to 2,626.20, 3,939.28 and 678.40 is: 1,017.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,626.20 : 3,939.28 = 678.40 : x
  2. Step 2: Convert to fraction form
    2,626.20/3,939.28 = 678.40/x
  3. Step 3: Cross multiply
    2,626.20x = 3,939.28 × 678.40
  4. Step 4: Simplify right side
    2,626.20x = 2,672,407.55
  5. Step 5: Solve for x
    x = 2,672,407.55/2,626.20
  6. Step 6: Final answer
    x = 1,017.59

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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.