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Finding the Fourth Proportional to 1,276.92, 1,914.90 and 411

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Solution

The fourth proportional to 1,276.92, 1,914.90 and 411 is: 616.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.92 : 1,914.90 = 411 : x
  2. Step 2: Convert to fraction form
    1,276.92/1,914.90 = 411/x
  3. Step 3: Cross multiply
    1,276.92x = 1,914.90 × 411
  4. Step 4: Simplify right side
    1,276.92x = 787,023.90
  5. Step 5: Solve for x
    x = 787,023.90/1,276.92
  6. Step 6: Final answer
    x = 616.35

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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.