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Finding the Fourth Proportional to 3,429, 5,143.50 and 1,120.50

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Solution

The fourth proportional to 3,429, 5,143.50 and 1,120.50 is: 1,680.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,429 : 5,143.50 = 1,120.50 : x
  2. Step 2: Convert to fraction form
    3,429/5,143.50 = 1,120.50/x
  3. Step 3: Cross multiply
    3,429x = 5,143.50 × 1,120.50
  4. Step 4: Simplify right side
    3,429x = 5,763,291.75
  5. Step 5: Solve for x
    x = 5,763,291.75/3,429
  6. Step 6: Final answer
    x = 1,680.75

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Similar ratio
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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.