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Finding the Fourth Proportional to 1,385.75, 2,078.96 and 411.86

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Solution

The fourth proportional to 1,385.75, 2,078.96 and 411.86 is: 617.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.75 : 2,078.96 = 411.86 : x
  2. Step 2: Convert to fraction form
    1,385.75/2,078.96 = 411.86/x
  3. Step 3: Cross multiply
    1,385.75x = 2,078.96 × 411.86
  4. Step 4: Simplify right side
    1,385.75x = 856,240.47
  5. Step 5: Solve for x
    x = 856,240.47/1,385.75
  6. Step 6: Final answer
    x = 617.89

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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.