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Finding the Fourth Proportional to 2,679.28, 4,018.61 and 830.40

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Solution

The fourth proportional to 2,679.28, 4,018.61 and 830.40 is: 1,245.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679.28 : 4,018.61 = 830.40 : x
  2. Step 2: Convert to fraction form
    2,679.28/4,018.61 = 830.40/x
  3. Step 3: Cross multiply
    2,679.28x = 4,018.61 × 830.40
  4. Step 4: Simplify right side
    2,679.28x = 3,337,063.35
  5. Step 5: Solve for x
    x = 3,337,063.35/2,679.28
  6. Step 6: Final answer
    x = 1,245.51

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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.