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Finding the Fourth Proportional to 919.89, 1,379.43 and 486.95

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Solution

The fourth proportional to 919.89, 1,379.43 and 486.95 is: 730.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.89 : 1,379.43 = 486.95 : x
  2. Step 2: Convert to fraction form
    919.89/1,379.43 = 486.95/x
  3. Step 3: Cross multiply
    919.89x = 1,379.43 × 486.95
  4. Step 4: Simplify right side
    919.89x = 671,706.54
  5. Step 5: Solve for x
    x = 671,706.54/919.89
  6. Step 6: Final answer
    x = 730.20

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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.