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Finding the Fourth Proportional to 919.96, 1,379.95 and 261.85

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Solution

The fourth proportional to 919.96, 1,379.95 and 261.85 is: 392.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.96 : 1,379.95 = 261.85 : x
  2. Step 2: Convert to fraction form
    919.96/1,379.95 = 261.85/x
  3. Step 3: Cross multiply
    919.96x = 1,379.95 × 261.85
  4. Step 4: Simplify right side
    919.96x = 361,337.20
  5. Step 5: Solve for x
    x = 361,337.20/919.96
  6. Step 6: Final answer
    x = 392.78

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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.