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Finding the Fourth Proportional to 2,874, 4,311.60 and 926.40

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Solution

The fourth proportional to 2,874, 4,311.60 and 926.40 is: 1,389.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,874 : 4,311.60 = 926.40 : x
  2. Step 2: Convert to fraction form
    2,874/4,311.60 = 926.40/x
  3. Step 3: Cross multiply
    2,874x = 4,311.60 × 926.40
  4. Step 4: Simplify right side
    2,874x = 3,994,266.24
  5. Step 5: Solve for x
    x = 3,994,266.24/2,874
  6. Step 6: Final answer
    x = 1,389.79

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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.